The coat of the domestic

dog The dog (''Canis familiaris'' or ''Canis lupus familiaris'') is a domesticated descendant of the gray wolf. Also called the domestic dog, it was selectively bred from a population of wolves during the Late Pleistocene by hunter-gatherers. ...

refers to the

hair Hair is a protein filament that grows from follicles found in the dermis. Hair is one of the defining characteristics of mammals. The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and ...

that covers its body. Dogs demonstrate a wide range of coat colors, patterns, textures, and lengths. As with other mammals, a dog's

fur A fur is a soft, thick growth of hair that covers the skin of almost all mammals. It consists of a combination of oily guard hair on top and thick underfur beneath. The guard hair keeps moisture from reaching the skin; the underfur acts as an ...

has many uses, including thermoregulation and protection from cuts or scratches; furthermore, a dog's coat plays an important role in the showing of purebred dogs.

Breed standard In animal husbandry or animal fancy, a breed standard is a description of the characteristics of a hypothetical or ideal example of a breed. The description may include phenotype, physical or morphology (biology), morphological detail, genotype, g ...

s often include a detailed description of the nature and attributes of that breed's ideal coat. A dog's coat is composed of two layers: a top coat of stiff

guard hairs Guard hair or overhair is the outer layer of hair of most mammals, which overlay the fur. Guard hairs are long and coarse and protect the rest of the pelage (fur) from abrasion and frequently from moisture. They are visible on the surface of the f ...

that help repel water and shield from dirt, and an undercoat of soft

down hair A fur is a soft, thick growth of hair that covers the skin of almost all mammals. It consists of a combination of oily guard hair on top and thick underfur beneath. The guard hair keeps moisture from reaching the skin; the underfur acts as an ...

s, to serve as insulation. Dogs with both under coat and top coat are said to have a ''double coat''. Dogs with a ''single coat'' have a coat composed solely of guard hairs, with little or no downy undercoat. The terms

and

are often used interchangeably when describing a dog's coat, however in general, a double coat, like that of the

Newfoundland Newfoundland and Labrador is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region of Labrador, having a total size of . As of 2025 the population ...

and most

livestock guardian dog A livestock guardian dog (LGD) is a dog type bred for the purpose of protecting livestock from predators. Livestock guardian dogs stay with the group of animals they protect as a full-time member of the flock or herd. Their ability to guard t ...

s, is referred to as a ''fur coat'', while a single coat, like that of the

Poodle The Poodle, called the in German () and the in French, is a breed of water dog. The breed is divided into four varieties based on size, the Standard Poodle, Medium Poodle, Miniature Poodle and Toy Poodle, although the Medium Poodle is no ...

, is referred to as a ''hair coat''.

Genetics

Domestic dogs exhibit diverse coat colours and patterns. In many mammals, different colour patterns are the result of the regulation of the

Agouti gene Agouti-signaling protein is a protein that in humans is encoded by the ASIP gene. It is responsible for the distribution of melanin pigment in mammals. Agouti interacts with the melanocortin 1 receptor to determine whether the melanocyte (pigment ...

, which can cause hair follicles to switch from making black or brown pigments to yellow or nearly white pigments. The most common coat pattern found in modern wolves is

agouti The agouti (, ) or common agouti is any of several rodent species of the genus ''Dasyprocta''. They are native to Central America, northern and central South America, and the southern Lesser Antilles. Some species have also been introduced else ...

, in which the upperside of the body has banded hairs and the underside exhibits lighter shading. The colour yellow is dominant to the colour black and is found in dogs across much of the world and the

dingo The dingo (either included in the species ''Canis familiaris'', or considered one of the following independent taxa: ''Canis familiaris dingo'', ''Canis dingo'', or ''Canis lupus dingo'') is an ancient (basal (phylogenetics), basal) lineage ...

in Australia. In 2021, a study of whole genome sequences taken from dogs and wolves focused on the genetic relationships between them based on coat colour. The study found that most dog colour

haplotypes A haplotype (haploid genotype) is a group of alleles in an organism that are inherited together from a single parent. Many organisms contain genetic material (DNA) which is inherited from two parents. Normally these organisms have their DNA orga ...

were similar to most wolf haplotypes, however dominant yellow in dogs was closely related to white in arctic wolves from North America. This result suggests a common origin for dominant yellow in dogs and white in wolves but without recent gene flow, because this clade was found to be genetically basal to the

golden jackal The golden jackal (''Canis aureus''), also called the common jackal, is a wolf-like canid that is native to Eurasia. The golden jackal's coat varies in color from a pale creamy yellow in summer to a dark tawny beige in winter. It is smaller a ...

and genetically distinct from all other canids. The most recent common ancestor of the golden jackal and the wolf lineage dates back to 2 million years ago. The study proposes that 35,000 years ago there was genetic

introgression Introgression, also known as introgressive hybridization, in genetics is the transfer of genetic material from one species into the gene pool of another by the repeated backcrossing of an interspecific hybrid with one of its parent species. Introg ...

into the

Late Pleistocene The Late Pleistocene is an unofficial Age (geology), age in the international geologic timescale in chronostratigraphy, also known as the Upper Pleistocene from a Stratigraphy, stratigraphic perspective. It is intended to be the fourth division ...

grey wolf from a

ghost population A ghost population is a population that has been inferred through using statistical techniques. Population studies In 2004, it was proposed that maximum likelihood or Bayesian approaches that estimate the migration rates and population sizes usin ...

of an extinct canid which had diverged from the grey wolf lineage over 2 million years ago. This colour diversity could be found 35,000 years ago in wolves and 9,500 years ago in dogs. A closely related haplotype exists among those wolves of Tibet which possess yellow shading in their coats. The study explains the colour relationships between modern dogs and wolves, white wolves from North America, yellow dogs, and yellowish wolves from Tibet. The study concludes that during the Late Pleistocene, natural selection laid the genetic foundation for modern coat colour diversity in dogs and wolves. During evolution of the dog from their wolf ancestors, coat colors in dogs were probably the inadvertent outcome of some other selective process, and were not likely initially selected for intentionally by humans. Research has found that tameness brings associated physical changes, including coat colouring and patterning. Domestic dogs often display the remnants of

countershading Countershading, or Thayer's law, is a method of camouflage in which animal coloration, an animal's coloration is darker on the top or upper side and lighter on the underside of the body. This pattern is found in many species of mammals, reptile ...

, a common natural camouflage pattern. The basic principle of countershading is when the animal is lit from above, shadows will be cast on the

ventral Standard anatomical terms of location are used to describe unambiguously the anatomy of humans and other animals. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position prov ...

side of the body. These shadows could provide a predator or prey with visual cues relating to the movement of the animal. By being lighter colored on the ventral side of the body, an animal can counteract this, and thereby fool the predator or prey. An alternative explanation is that the

dorsal Dorsal (from Latin ''dorsum'' ‘back’) may refer to: * Dorsal (anatomy), an anatomical term of location referring to the back or upper side of an organism or parts of an organism * Dorsal, positioned on top of an aircraft's fuselage The fus ...

and ventral sides of an animal experience different selection pressures (from the need to blend into different backgrounds when viewed from above and below) resulting in differing coloration.

Nomenclature of colours and patterns

Colors

The same colour may be referred to differently in different breeds. Likewise, a same term may mean different colourations in different breeds.

Brown, chocolate, liver

Brown, chocolate and liver are the most common terms used to refer to the bb-dilution of black pigment to a dark brown. Depending on breed and exact shade, terms such as mahogany, midtone brown, grey-brown, blackish brown are used. ''Sedge'' and ''deadgrass'' are used to describe the desired Chesapeake Bay Retriever color that resembles "that of its working surroundings" as closely as possible. File:Chesapeake Bay Retriever1.jpg, Brown

Chesapeake Bay Retriever The Chesapeake Bay Retriever is a large dog breed, breed of dog belonging to the retriever, Gun dog, gundog, and sporting Breed Groups (dog), breed groups. The breed was developed in the United States Chesapeake Bay area during the 19th century. H ...

File:Hilu the Australian Kelpie dog.jpg, Red

Australian Kelpie The Australian Kelpie, or simply Kelpie, is an Australia, Australian Herding dog, sheepdog capable of Muster (livestock), mustering and droving with little or no guidance. It is a medium-sized dog and comes in a variety of colours. The Kelpie ha ...

File:Chocolate Labrador Retrievers pair.jpg, Dark and light chocolate

Labrador Retrievers The Labrador Retriever or simply Labrador or Lab is a British list of dog breeds, breed of water dog retriever gun dog. It was developed in the United Kingdom from St. John's water dogs imported from the Newfoundland Colony, colony of Newfoun ...

Red

Red refers to reddish shades of orange, brown, and tan. Terms used include orange, red-gold, cinnamon, tan, and ruby. Genetically a dog called red is usually a clear sable (with little to no eumelanin tipping on hairs) or a ruddy recessive yellow. In some breeds, "red" refers to what would usually be called brown, chocolate, or liver. A "red merle" is always a liver-based merle. In

Australian Cattle Dog The Australian Cattle Dog, or simply Cattle Dog, is a breed of herding dog developed in Australia for droving cattle over long distances across rough terrain. This breed is a medium-sized, short-Coat (dog), coated dog that occurs in two main ...

s, "red" stands for a densely ticked liver-based colouration with an overall red-grey appearance. File:Seter irlandzki profil 5o899.jpg, Red

Irish Setter The Irish Setter (, literally "red setter") is a setter, a breed of gundog, and family dog originating in Ireland. The term ''Irish Setter'' is commonly used to encompass the show-bred dog recognised by the American Kennel Club as well a ...

File:01 Chow Chow.jpg, Red

Chow Chow The Chow Chow is a spitz-type of dog breed originally from Northern China. The Chow Chow is a sturdily built dog, square in profile, with a broad skull and small, triangular, erect ears with rounded tips. The breed is known for a very dense do ...

File:Owning the back step (3641313887).jpg, Red

Standard Poodle The Poodle, called the in German () and the in French, is a Dog breed, breed of water dog. The breed is divided into four varieties based on size, the Standard Poodle, Medium Poodle, Miniature Poodle and Toy Poodle, although the Medium Po ...

File:Ariel Cavalier King Charles Spaniel.jpg, Ruby

Cavalier King Charles Spaniel The Cavalier King Charles Spaniel (CKCS) is a British list of dog breeds, breed of toy dog of spaniel type. Four colours are recognised: Blenheim (chestnut and white), Tricolor (dog), tricolour (black/white/tan), black and tan, and ruby; the coa ...

File:Australian Cattle Dog red.JPG, Red Australian Cattle Dog File:A Shiba Inu.jpg, Red

Shiba Inu The is a breed of hunting dog from Japan. A small-to-medium breed, it is the smallest of the six original dog breeds native to Japan. The Shiba Inu was originally bred for hunting. Its name literally translates to "brushwood dog", as it is us ...

File:Basset Fauve de Bretagne portrait.jpg, Red

Basset Fauve de Bretagne The Basset Fauve de Bretagne is a short-legged hunting breed of dog of the scent hound type, originally from Brittany, a historical duchy of France. Description Appearance The Basset Fauve de Bretagne is a smallish hound, built along the same li ...

File:Cocker spaniel angielski zlotyy.jpg, Red

Cocker Spaniel Cocker Spaniels are dogs belonging to two breeds of the spaniel dog type: the American Cocker Spaniel and the English Cocker Spaniel, both of which are commonly called simply Cocker Spaniel in their countries of origin. In the early 20th century, ...

File:Vizsla-profile.jpg,

Vizsla The Vizsla (), also known as Hungarian Vizsla, Magyar Vizsla or Hungarian Pointer, is a dog breed from Hungary and belongs to the Fédération Cynologique Internationale (FCI) group 7 ( Pointing Dogs), the Canadian Kennel Club (CKC) group 1 ( ...

Gold and yellow

Gold refers specifically to a rich reddish-yellow and its variants, whereas yellow can refer to any shade of yellow and tan. Terms used include yellow-gold, lion-colored, fawn, apricot, wheaten, tawny, straw, yellow-red, mustard, sandy, honey, blond, and lemon. Dogs called golden or yellow tend to be recessive yellow, but can also be sable. File:Agility Poodle.jpg, Apricot

File:3 Golden Retrievers in the water.jpg, Dark Golden Retrievers File:Stretched Dachshund.jpg, Yellow

Dachshund The dachshund ( or ; German: 'badger dog'), also known as the wiener dog or sausage dog, badger dog, doxen and doxie, is a short-legged, long-bodied, hound-type dog breed. The dog may be smooth-haired, wire-haired, or long-haired, with varie ...

File:YellowLabradorLooking.jpg, Yellow

Labrador Retriever The Labrador Retriever or simply Labrador or Lab is a British list of dog breeds, breed of water dog retriever gun dog. It was developed in the United Kingdom from St. John's water dogs imported from the Newfoundland Colony, colony of Newfoun ...

File:Golden retriever.jpg, Dark Golden Golden Retriever File:Milù 050.JPG, Orange

Pomeranian (dog) The Pomeranian (also known as a Pom, Pommy or Pome) is a dog breed, breed of dog of the Spitz type that is named for the Pomerania region in north-west Poland and north-east Germany in Central Europe. Classed as a toy dog breed because of its s ...

File:Zazu the dog on Lion's Head mountain 24.jpg, Yellow

mixed breed A mixed breed is a domesticated animal descended from multiple breeds of the same species, often breeding without any human intervention, recordkeeping, or selective breeding. Examples include: * Mixed-breed dog A mongrel, mutt, or mixed ...

of unknown parentage

Cream

Cream refers to a pale yellowish or tannish colour which can be almost white. File:Poodle, white standard 01.jpg, Pale cream

File:FrenchBulldog.jpg, Cream

French Bulldog The French Bulldog () is a French breed of companion dog or toy dog. It appeared in Paris in the mid-nineteenth century, apparently the result of cross-breeding of Toy Bulldogs imported from England and local Parisian ratters.Akita

Fawn

Fawn typically refers to a yellow, tan, light brown, or cream dog that has a dark melanistic mask. With

Weimaraner The is a German breed of hunting dog of medium to large size, with history going back at least to the nineteenth century. It originated in the area of the city of Weimar (then in Saxe-Weimar-Eisenach, now in the state of Thuringia), for which ...

s, ''fawn'' refers to their typical brownish grey colouration that with other breeds is usually called lilac. File:Pug 600.jpg, Silver Fawn

Pug The Pug is a breed of dog with the physically distinctive features of a wrinkly, short-muzzled face, and curled tail. An ancient breed, with roots dating back to 400 B.C., they have a fine, glossy coat that comes in a variety of colors, most ...

File:Westgort Anticipation.JPG, Fawn

English Mastiff The English Mastiff, or simply the Mastiff, is a British list of dog breeds, breed of very large dog of mastiff type. It is likely descended from the ancient Alaunt and Pugnaces Britanniae, with a significant input from the Alpine Mastiff in th ...

File:Malinois puppy.JPG, Fawn Belgian Shepherd Malinois with breed-typical ''extended arkmask'' File:Male fawn Boxer undocked.jpg, Fawn

Boxer Boxer most commonly refers to: *Boxer (boxing), a competitor in the sport of boxing * Boxer (dog), a breed of dog Boxer or boxers may also refer to: Animal kingdom * Boxer crab * Boxer shrimp, a small group of decapod crustaceans * Boxer snipe ee ...

File:HuntHillBoerboelsGunston1.jpeg, Fawn

Boerboel The Boerboel () is a South African breed of large dog of mastiff type, used as a family guard dog. It is large, with a short coat, strong bone structure and well-developed muscles. It is recognised by the Kennel Union of Southern Africa, but ...

Black

Black is a pure black that can get grizzled as the dog ages, or have a tendency to gain a brownish cast when exposed to the elements. File:Newfoundland dog.jpg,

File:Black_labrador_on_green_grass.png, Elderly black

with age-related grey hairs on head and feet File:Schipperke image 001.jpg, Black

Schipperke A Schipperke (; ) is a small breed of dog that is believed to have originated in the 1600s in Flanders.Alexandra Anastasio (January 31, 2017) American Kennel Club official websit "What Was the Schipperke Bred To Do"/ref> There has been a long in ...

File:Crni Patuljasti šnaucer.jpg, Black

Schnauzer A Schnauzer ( , ; plural , ; ) is a dog breed type that originated in Germany from the 14th to 16th centuries. The term comes from the German word for "snout" and means colloquially "moustache",

Blue

Blue is a cool-toned, metallic grey. It typically means a ''d/d'' dilution of black pigment, a grey colouration that is grey from birth, but has a wide range of breed-specific meanings. In

Kerry Blue Terrier The Kerry Blue Terrier (also known as the Irish Blue Terrier) () is a breed of dog. Originally bred to control vermin including rats, rabbits, badgers, ferrets, foxes, otters, hares, deer, and even wolves, over time the Kerry became a general wo ...

s, and

Bearded Collie The Bearded Collie or Beardie is a British breed of herding dog of collie type. It was formerly used primarily by Scottish shepherds, but now commonly kept as a family companion. Weights are usually in the range , while height at the withers ...

s, "blue" refers to colouration that is black at birth and progressively greys out as the dog matures. In

Australian Shepherd The Australian Shepherd is a breed of herding dog from the United States. The name of the breed is technically a misnomer, as it was developed in California in the 19th century. It is believed to have its origins in sheepdog breeds from northwe ...

Rough Collie The Rough Collie (also known as the Long-Haired Collie) is a long-coated dog breed of medium to large size that, in its original form, was a type of collie used and bred for herding sheep in Scotland. More recent breeding has focused on the Co ...

s, and

Shetland Sheepdog The Shetland Sheepdog, also known as the Sheltie, is a breed of herding dog that originated in the Shetland Islands of Scotland. It was formally recognized by the Kennel Club in 1909. It was originally called the ''Shetland Collie'', but this c ...

s, blue means a blue (black-based)

merle Merle may refer to: People and fictional characters *Merle (given name), a list of men, women and fictional characters *Merle (surname), a list of people Others *Merle (dog coat), a pattern in dogs’ coats *Merle (grape), another name for the w ...

. In

Australian Silky Terrier The Australian Silky Terrier or simply Silky Terrier (depending on the breed registry) is a small breed of dog of the terrier dog type. The breed was developed in Australia, although the ancestral types and breeds were from Great Britain. It is c ...

s, blue means a saddle-type black and tan pattern, where the black parts of the coat progressively fade to a steel grey as the dog matures and in

s, blue stands for a densely ticked black-based colouration with an overall blue-grey appearance. File:Standing_Neo.jpg, Blue

Neapolitan Mastiff The Neapolitan Mastiff or is an Italian breed of large dog of mastiff type. It was recognised as a breed by the Ente Nazionale della Cinofilia Italiana in 1949, and accepted by the Fédération Cynologique Internationale in 1956. It descends ...

File:PastorBelga-AlemaoDSC 2788.jpg, Blue

mixed-breed dog A mongrel, mutt, or mixed-breed dog is a dog that does not belong to one officially recognized Dog breed, breed, including those that result from intentional Dog breeding, breeding. Although the term ''mixed-breed dog'' is sometimes preferred, m ...

File:Australian Silky Terrier Karlyermai Classic Touch.jpg, Blue

File:Australian blue cattle dog 04.JPG, Blue Australian Cattle Dog

Grey

Grey simply means a grey colouration of any shade. It can be used as an alternative synonym of blue, but tends to mean some other type of grey than the ''d/d'' dilution of black. Synonyms include silver, pepper, grizzle, slate, blue-black grey, black and silver, steel. Greys of a dusty or brownish cast are often lilac, a ''d/d'' dilution of liver, and this colouration does not have much of a commonly recognised name. Across various breeds, it is called lavender, silver-fawn, isabella, fawn, café au lait or silver beige. In Poodles, a blue is a very slowly fading, very dark steel grey, whereas a silver is a quicker to clear, much lighter grey that can range from a pale platinum to a steel grey. Both are black at birth with minimal markings to indicate future change. Similarly, café au lait is a slower and darker and silver beige a quicker and lighter progressively greying brown, i.e. liver. File:Waterloo 027 4x6.JPG, Lighter and darker fawn

s File:Miniature Schnauzer 2.jpg, Silver

Miniature Schnauzer The Miniature Schnauzer is a dog breed, breed of small dog of the Schnauzer type that originated in Germany in the mid-to-late 19th century. Miniature Schnauzers may have been developed from the smallest specimens of the Standard Schnauzer, or c ...

File:Spooky (8359203146).jpg, Young Silver

in the earliest stages of graying out File:Doberman Fawn 001.jpg, Isabella/fawn

Dobermann The Dobermann is a German list of dog breeds, breed of medium-large working dog of pinscher type. It was originally bred in Thuringia in about 1890 by Karl Friedrich Louis Dobermann, Louis Dobermann, a tax collector.albino Albinism is the congenital absence of melanin in an animal or plant resulting in white hair, feathers, scales and skin and reddish pink or blue eyes. Individuals with the condition are referred to as albinos. Varied use and interpretation of ...

dogs. A white dog, as opposed to an albino one, has dark pigment around the eye rims and nose, often coupled with dark-colored eyes. There is often some coat identifiable as cream between the dog's shoulder blades. Extreme piebald dogs can also appear all white, but are caused by a separate factor. File:American Eskimo Dog.jpg, White

American Eskimo Dog The American Eskimo Dog is a breed of companion dog, originating in Germany. The American Eskimo Dog is a member of the Spitz family. The breed's progenitors were German Spitz, but due to anti-German sentiment during the First World War, it was r ...

File:Bichon Frise 600.jpg, White

Bichon Frisé The Bichon Frisé or Bichon à Poil Frisé is a Franco-Belgian breed of small toy dog of bichon type. It was recognised by the Société Centrale Canine in 1933 and by the Fédération Cynologique Internationale in 1959. Etymology The Fren ...

File:Maltese at NZ National Dog Show.jpg, White

Maltese dog Maltese dog refers both to an ancient variety of dwarf, white-coated dog breed from Italy and generally associated also with the island of Malta, and to a modern dog breed, breed of similar dogs in the toy group, genetically related to the B ...

File:Coton de Tulear puppy.jpg, White

Coton de Tulear The Coton de Tuléar is a breed of small dog named for the city of Tuléar (also known as Toliara) in Madagascar. This breed is thought to have originated from a group of small white dogs that swam across the Malagasy channel following a shipwreck ...

puppy File:Bruno spitz japones.jpg, White

Japanese Spitz The is a small to medium breed of dog of the Spitz type. There are varying standards around the world as to the ideal size of the breed, but they are always larger than their smaller cousins, the Pomeranian. They were developed in Japan in t ...

File:Samoyed Image 001.jpg,

Samoyed dog The Samoyed ( or ; , or ) is a breed of herding dog with a thick, white, double-layered coat. They are spitz, spitz-type dogs which take their name from the Samoyeds, Samoyedic peoples of Siberia. Descending from the Nenets Herding Laika, they ...

File:Westhighlandterrier.jpg,

West Highland White Terrier The West Highland White Terrier (commonly shortened to Westie) is a dog breed, breed of dog from Scotland with a distinctive white harsh coat and somewhat soft white undercoat. It is a medium-sized terrier, though with longer legs than other ...

Patterns

The same pattern may be referred to differently in different breeds.

Length and texture

Dogs demonstrate an enormous diversity in coat length and texture, from the very short and smooth coat seen in the

vizsla The Vizsla (), also known as Hungarian Vizsla, Magyar Vizsla or Hungarian Pointer, is a dog breed from Hungary and belongs to the Fédération Cynologique Internationale (FCI) group 7 ( Pointing Dogs), the Canadian Kennel Club (CKC) group 1 ( ...

s, to the wiry coat of a

Scottish Terrier The Scottish Terrier (; also known as the Aberdeen Terrier), popularly called the Scottie, is a dog breed, breed of dog. Initially one of the highland breeds of terrier that were grouped under the name of ''Skye Terrier'', it is one of five br ...

and the corded coat of the Puli and the

Komondor The Komondor (), also known as the Hungarian sheepdog, is a large, white-coloured Hungarian breed of livestock guardian dog with a long, corded coat. Sometimes referred to as ' mop dogs' due to their appearance, the Komondors are a long-est ...

. Generally, coats vary along three categories: length (long vs. short), texture (curly vs. straight), and coarseness (wire-haired vs. non-wire). These three categories all interact with one another; thus, one can see a short, curly, and wired coat in the

Wirehaired Pointing Griffon The Wirehaired Pointing Griffon (also called the Korthals Griffon and the Griffon d'arrêt à poil dur Korthals in France and Quebec) is a breed of dog used in hunting as a gundog. It is sometimes considered to be Dutch in ancestry, due to ...

, and a long, straight, and non-wired coat in the Pomeranian. Additionally, breeds show variation in patterns of growth - that is to say, parts of the dog's body where the coat may be longer or shorter. The same gene that controls wiriness of hair also causes furnishings to be present (e.g. beard, moustache, eyebrows) - compare the

bearded collie The Bearded Collie or Beardie is a British breed of herding dog of collie type. It was formerly used primarily by Scottish shepherds, but now commonly kept as a family companion. Weights are usually in the range , while height at the withers ...

, furnishings present, to the

border collie The Border Collie is a British list of dog breeds, breed of herding dog of the collie type of medium size. It originates in the region of the Anglo-Scottish border, and descends from the traditional Sheep dog, sheepdogs once found all over the ...

, which lacks furnishings. Some breeds show feathering: fringes of longer hair on the ears, belly, tail, and back of the legs (e.g.,

Saluki The Saluki or Persian hound (Persian:سگ تازی، Arabic: سلوقي) is a standardised breed developed from sighthounds – dogs that hunt primarily by sight rather than strong scent – that was once used by nomadic tribes to run down game ...

and any of the setters). Dogs also vary in the thickness of the undercoat. Some dogs have only a single (rather than a double) coat, or a very reduced undercoat (e.g. the

), which results in a thinner coat. Certain breeds, especially spitz-type breeds, tend to have a thicker undercoat, which helps retain heat in cold and wet weather. Furthermore, complete hairlessness on parts of the body is present in breeds such as the Chinese Crested or the

Xoloitzcuintli The Xoloitzcuintle (or Xoloitzquintle, Xoloitzcuintli, or Xolo) is one of several breeds of hairless dog. It is found in standard, intermediate, and miniature sizes. The Xolo also comes in a coated variety, totally covered in fur. Coated and hair ...

Shedding

Shedding of hair can occur continuously, but in many breeds is strongly influenced by hormones. Seasonal shedders shed most in spring and fall, following an increase or decrease in day length, and least in summer and winter, in response to constant day length. Cold temperatures stimulate hair growth, so that the heaviest shedding is in spring on dogs living in cold climates. Artificial lighting can alter the seasonal shedding pattern of dogs who live indoors. Other hormonal influences include dietary factors, reproductive hormones in intact dogs, and various medical conditions and disorders. Shedding that is done in a short period of time is known as "blowing the coat" or "blowing coat". Among the other coat types, dogs with fine silky coats (e.g., spaniels) are generally moderate shedders, those with an intermediate coat texture (e.g., mountain dogs) are generally heavy shedders, and those with thick stand-offish coats (e.g., spitzes) are generally very heavy shedders. "Non-shedding" dogs have greatly-reduced shedding due to alterations to the hair follicle growth cycle: * homozygosity for the

furnishings ] The decorative arts are arts or crafts whose aim is the design and manufacture of objects that are both beautiful and functional. This includes most of the objects for the interiors of buildings, as well as interior design, but typically excl ...

(wire) allele - Most breeds with facial furnishings (including ones whose faces are usually shaved removing the furnishings) are low-shedding, but they must be homozygous, so dogs of mixed wire/non-wire parentage (e.g., terrier crosses or breeds with wire and non-wire varieties) can be heavy shedders. There are a few furnished breeds that shed more (e.g., Old English Sheepdog, Bearded Collie, Briard,

Otterhound The Otterhound is an English dog breed. It is a scent hound and is currently recognised by the Kennel Club as a Vulnerable Native Breed with around 600 animals worldwide.

); * at least one copy of the single-coat (non-shedding) allele - Most dogs with a smooth coat are low shedding, as well as the fringed or flat coat. There are breeds with a very short coat that shed more (e.g., Basset Hound, English Bulldog, Pug, Toy Fox Terrier, Dalmatian, Vizsla, German Shorthaired Pointer); * single coat (no undercoat) plus furnishings (homozygous) - These breeds shed the least (e.g.,

, Soft-coated Wheaten Terrier).

Hypoallergenic coat

" gs are a relevant source of allergens, but diagnosing dog-related allergies may present difficulties ..." Some dog breeds have been promoted as hypoallergenic (which means ''less allergic'', not free of allergens) because they shed very little. However, no canine is known to be completely nonallergenic. Often the problem is with the dog's saliva or dander, not the fur. Although breeds such as

poodles The Poodle, called the in German () and the in French, is a breed of water dog. The breed is divided into four varieties based on size, the Standard Poodle, Medium Poodle, Miniature Poodle and Toy Poodle, although the Medium Poodle is no ...

Bedlington terrier The Bedlington Terrier is a dog breed, breed of small dog named after the mining town of Bedlington, Northumberland in North East England. Originally bred to hunt, the Bedlington Terrier has since been used in dog racing, numerous List of dog s ...

bichon A bichon is a distinct type of toy dog; it is typically kept as a companion dog. Believed to be descended from the Barbet, it is believed the bichon-type dates to at least the 11th century; it was relatively common in 14th-century France, wh ...

s, yorkies, and wire-haired

terriers Terrier () is a type of dog originally bred to hunt vermin. A terrier is a dog of any one of many breeds or landraces of the terrier type, which are typically small, wiry, game, and fearless. There are five different groups of terrier, wi ...

are commonly represented as being hypoallergenic due to reduced shedding, the reaction that an individual person has to an individual dog may vary greatly. In a report, describing dog allergen extracts of dog hair, belonging to patients' dogs or from dogs of the same breed, with low molecular mass that are absent in extracts of commercial allergen test kits, it has been found that " ctors related to individual dogs seem to influence the allergenicity more than breed or gender."

Show coats

The nature and quality of a

purebred dog A dog breed is a particular type of dog that was purposefully bred by humans to perform specific tasks, such as herding, hunting, and guarding. Dogs are the most variable mammal on Earth, with artificial selection producing upward of 360 global ...

's coat is important to the

dog fancy ''Dog Fancy'' was a monthly magazine dedicated to dogs, owners of dogs, and breeders of dogs. It was founded in 1970 and was described by its publishing company, BowTie Inc., as "the world’s most widely read dog magazine". BowTie Inc. also pub ...

in the judging of the dog at

conformation show A dog show is an animal show; it is an event where dogs are exhibited. A conformation show, also referred to as a '' breed show'', is a kind of dog show in which a judge, familiar with a specific dog breed, evaluates individual purebred dogs ...

s. The exact requirements are detailed in each breed's

breed standard In animal husbandry or animal fancy, a breed standard is a description of the characteristics of a hypothetical or ideal example of a breed. The description may include phenotype, physical or morphology (biology), morphological detail, genotype, g ...

and do not generalise in any way, and the terminology may be very different even when referring to similar features. See individual breed articles for specific information.

Nutritional impacts on coat

A dog's coat is an outward indicator of internal well-being. For this reason, coat health is an important aspect of pet care to many dog owners. Dog coats can be impacted by nutritional components from the diet. Below is a table that summarizes the effects of several nutrients (minerals, vitamins) on the domestic canine coat, based on current evidence:

Trace minerals In the context of nutrition, a mineral is a chemical element. Some "minerals" are essential for life, but most are not. ''Minerals'' are one of the four groups of essential nutrients; the others are vitamins, essential fatty acids, and essenti ...

Zinc

Zinc contributes to hair growth and can prevent hair from becoming dry and brittle. In addition to, zinc when supplemented in combination with linoleic acids has been found to improve the coat of canines by reducing water loss in the trans-epidermal layer of the skin. Dogs can obtain zinc in their diet, through the addition of various ingredients, including; red meats, whole grains, poultry by-product meals, and fish meals.

Copper

Copper is a trace mineral that is required in the diet of canines at 7.3 mg/kg. Copper is involved in multiple enzymatic pathways. In dogs, a lack of copper in the diet, leading to a copper deficiency, results in incomplete keratinization. This leads to a dry coat, hypo-pigmentation, and discoloration of the coat.

Selenium

Selenium is another one of the many trace minerals essential for a dog's diet. Selenium is typically required in lower levels in comparison to other minerals. It is involved in the prevention of oxidative damage as well as the production of anti-oxidants. Selenium aids in the promotion of coat growth. Lack of selenium in the diet of a dog can contribute to the occurrence of sparse coat growth. Dogs can obtain selenium in their diet through the addition of various ingredients including; tuna fish, halibut, sardines, beef, chicken, and egg.

Vitamins

Vitamin A

Vitamin A Vitamin A is a fat-soluble vitamin that is an essential nutrient. The term "vitamin A" encompasses a group of chemically related organic compounds that includes retinol, retinyl esters, and several provitamin (precursor) carotenoids, most not ...

deficiency can lead to rough coat, scaling of skin, and other

dermatitis Dermatitis is a term used for different types of skin inflammation, typically characterized by itchiness, redness and a rash. In cases of short duration, there may be small blisters, while in long-term cases the skin may become thickened ...

issues like

alopecia Hair loss, also known as alopecia or baldness, refers to a loss of hair from part of the head or body. Typically at least the head is involved. The severity of hair loss can vary from a small area to the entire body. Inflammation or scarring ...

. It is also essential for cells to properly proliferate keratinocytes, which are epithelial cells that produce keratin on the outermost layer of the skin for the cortisol cells of the hair follicle. A deficiency in vitamin A can cause the common symptoms of dermatitis (dry, scaling skin and dull coat).

Vitamin B7 (Biotin)

Vitamin B7, also known as

biotin Biotin (also known as vitamin B7 or vitamin H) is one of the B vitamins. It is involved in a wide range of metabolic processes, both in humans and in other organisms, primarily related to the utilization of fats, carbohydrates, and amino acids. ...

, is a water-soluble nutrient that is known to play a role associated with the maintenance and development of hair starting from the follicle. Although it has not been clinically shown to improve hair growth with supplementation alone, it has been shown to reverse deficiency in dogs born deficient. Symptoms of biotin deficiency include

and achromotrichia. A clinical study of biotin showed the importance of biotin in coat pigmentation. There different stages of hair development, as shown in clinical studies using mice. Each stage of hair development has a different sensitivity to biotin present in the body. For example, the shaft development is not greatly affected by biotin access. During the last stage, the amount of biotin available for use by the body will alter the success of that development greatly. Throughout the hair development, most stages of growth are completed, but it was found that in the last stage, where biotin levels were insufficient, there was an incorrect

keratinization Keratin () is one of a family of structural fibrous proteins also known as ''scleroproteins''. It is the key structural material making up scales, hair, nails, feathers, horns, claws, hooves, and the outer layer of skin in vertebrates. Kera ...

of the root of the hair, causing the hair to fall out of the body. The supplementation of biotin cannot reverse affects caused by deficiency, but as soon as supplementation is given and biotin levels are restored to adequacy, the body begins to produce the usual hair growth and color it would before the deficiency took place.

Essential fatty acids

Polyunsaturated fatty acids In biochemistry and nutrition, a polyunsaturated fat is a fat that contains a polyunsaturated fatty acid (abbreviated PUFA), which is a subclass of fatty acid characterized by a backbone with two or more carbon–carbon double bonds. Some polyunsa ...

found in the diet play a critical role in the maintenance of a healthy coat in dogs, and have even been shown to improve coat condition when supplemented in the diet. Furthermore, diets lacking essential fatty acids in their diet will manifest as unkept, matted coat. Omega fatty acids 3 and 6 are highly unsaturated fatty acids, making them especially metabolically active. The proper combination of these omega fatty acids is crucial to achieve optimal benefits. Proper omega 6:3 ratios have been shown to diminish allergy triggered immune responses, thus improving overall coat condition. The National Research Council (NRC) recommends a 2.6:1 to 26:1 omega 6:3 ratio for adult dog maintenance diets. The proper ratio of these fatty acids is crucial because each has an opposing role in inflammation within the body and both compete for the same enzymatic pathway. Dogs, like many mammals, lack the desaturase enzymes capable of interconverting omega 3 and 6 fatty acids. Therefore, the amount of inflammation in the body is dependent on the ratio between omega 3 and 6 fatty acids. Too little inflammation suppresses the immune system and the body's ability to heal, however excessive inflammation can irritate the skin and reduce the coat's overall appearance. Aside from omega fatty acids, lipid content in the canine diet is an important aspect of coat health. The fat soluble vitamins (A, D, E and K) require lipids present in the diet for absorption, transport and deposition in canine adipose tissue. The specific role of vitamins A and E for coat health are explored elsewhere in this article, as they pertain to immune function. Another pet food regulating body, the Association of American Feed Control Officials (AAFCO), recommends that

Vitamin E Vitamin E is a group of eight compounds related in molecular structure that includes four tocopherols and four tocotrienols. The tocopherols function as fat-soluble antioxidants which may help protect cell membranes from reactive oxygen speci ...

supplementation increase as polyunsaturated fatty acids are added to diet in order to counteract

lipid oxidation Lipid peroxidation, or lipid oxidation, is a complex chemical process that leads to oxidative degradation of lipids, resulting in the formation of peroxide and hydroperoxide derivatives.{{Cite journal , last1=Ayala , first1=Antonio , last2=Muñoz ...

and maintain the potency. In addition, high fat diets in dogs were shown to dramatically improve coat sheen and appearance. It is thought excess cholesterol esters are incorporated into the hair follicle, leading to the improved coat appearance. The same study, by Kirby, Hester and Bauer (2007), stated the optimal approach to an improved coat in dogs is a combination of increased dietary fat and the proper amount of polyunsaturated fatty acids.

Omega 3 (linolenic acid)

Omega 3 fatty acid, also known as

linolenic acid Linolenic acid is a type of naturally-occurring fatty acid. It can refer to either of two octadecatrienoic acids (i.e. with an 18-carbon chain and three double bonds, which are found in the '' cis'' configuration), or a mixture of the two. Lino ...

, is an anti-inflammatory compound. Linolenic acid is found in the oil from flaxseeds, soybean and canola. Some better known examples of linolenic acid are the metabolic derivatives

eicosapentaenoic acid Eicosapentaenoic acid (EPA; also icosapentaenoic acid) is an omega−3 fatty acid. In physiological literature, it is given the name 20:5(''n''−3). It also has the trivial name timnodonic acid. In chemical structure, EPA is a carboxylic acid wi ...

(EPA) and docosahexanoic acid (DHA). EPA inhibits the enzyme delta-5-desaturase, which prevents the synthesis of

arachidonic acid Arachidonic acid (AA, sometimes ARA) is a polyunsaturated omega−6 fatty acid 20:4(ω−6), or 20:4(5,8,11,14). It is a precursor in the formation of leukotrienes, prostaglandins, and thromboxanes. Together with omega−3 fatty acids an ...

which is an inflammatory omega 6. DHA acts even earlier in omega 6 metabolism, by inhibiting delta-6-desaturase. The anti-inflammatory properties of omega 3s stem from their ability to inhibit the inflammatory action of omega 6 fatty acids. A functional minimum has not been set forth by AAFCO, as one has yet to be determined. A reduction in inflammation of somatic tissues, skin especially, supports coat health.

Omega 6 (linoleic acid)

Omega 6 fatty acid, also known as

linoleic acid Linoleic acid (LA) is an organic compound with the formula . Both alkene groups () are ''cis''. It is a fatty acid sometimes denoted 18:2 (n−6) or 18:2 ''cis''-9,12. A linoleate is a salt or ester of this acid. Linoleic acid is a polyunsat ...

, is found in poultry fat and the oil from safflower, sunflower, corn and flaxseed. Arachidonic acid is a well known metabolic derivative of linoleic acid, found only in animal sources. As mentioned above, arachidonic acid is a pro-inflammatory compound. It is critical to note once again that canines are unable to interconvert between omega fatty acids and over supplying linoleic acid promotes excessive inflammation in the body, which can potentially reverse the coat benefits seen by supplying omega fatty acids in the diet. In contrast, linoleic acid is also required for

epidermal The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and hypodermis. The epidermal layer provides a barrier to infection from environmental pathogens and regulates the amount of water relea ...

lipid function and water retention, which benefits coat shine. Having linoleic acid present in the diet has demonstrated a positive effect on skin, and thus by extension, coat.

References

External links

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