The Bullmastiff is an English

breed A breed is a specific group of breedable domestic animals having homogeneous appearance (phenotype), homogeneous behavior, and/or other characteristics that distinguish it from other organisms of the same species. In literature, there exist seve ...

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. ...

mastiff A mastiff is a large and powerful Dog type, type of dog. Mastiffs are among the largest dogs, and typically have a short Coat (dog), coat, a long low-set tail and large feet; the skull is large and bulky, the muzzle broad and short (brachycephal ...

type and large size, with a solid build and a short muzzle. It was developed as a

guard dog A guard dog or watchdog is a dog used to watch for and guard people or property against unwanted human or animal intruders. A dog trained to attack intruders is known as an attack dog. History Dogs have been used as guardians since ancient ...

in the nineteenth century by

cross-breeding A crossbreed is an organism with purebred parents of two different breeds, varieties, or populations. A domestic animal of unknown ancestry, where the breed status of only one parent or grandparent is known, may also be called a crossbreed though ...

the

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 ...

with the now-extinct

Old English Bulldog The Old English Bulldog is an extinct dog breed, breed of dog. Physical characteristics The Old English Bulldog was compact, broad and muscular, as reflected in the painting ''Crib and Rosa''. Through John Scott's engraving, this painting ...

. It was recognised as a breed by

The Kennel Club The Royal Kennel Club (KC) is the official kennel club of the United Kingdom. It is the oldest recognised kennel club in the world. Its role is to oversee various canine activities including dog shows, dog agility and working trials. It also ...

in 1924.

History

The origins of the Bullmastiff are unclear. In the 18th century, in some regions of England, the

and

were commonly inter-bred to produce dogs suitable for guarding people and their property. By the beginning of the 20th century, this cross-breed was in widespread use as an aid to

gamekeeper In the United Kingdom, a gamekeeper (often abbreviated to keeper) is a person who manages an area of countryside (e.g., areas of woodland, moorland, waterway or farmland) to make sure that there is enough Game (hunting), game for hunting, or fish ...

s in the control of

poaching Poaching is the illegal hunting or capturing of wild animals, usually associated with land use rights. Poaching was once performed by impoverished peasants for subsistence purposes and to supplement meager diets. It was set against the huntin ...

. They were bred for strength, size and speed using a cross of the tough, heavy and aggressive 19th century

Bulldog The Bulldog is a British breed of dog of mastiff type. It may also be known as the English Bulldog or British Bulldog. It is a stocky, muscular dog of medium size, with a large head, thick folds of skin around the face and shoulders and a rel ...

with the large, strong, less aggressive

Mastiff A mastiff is a large and powerful Dog type, type of dog. Mastiffs are among the largest dogs, and typically have a short Coat (dog), coat, a long low-set tail and large feet; the skull is large and bulky, the muzzle broad and short (brachycephal ...

.Walkey B. The Bullmastiff Fancier's Manual. Sechelt B.C., Canada: Coast Arts Publishing; 1992 As a result, the Bullmastiff is known as the Gamekeeper's Night Dog. The Bullmastiff was recognised as a breed by

in 1924. Dogs had to have a minimum of four generations of descent from Bullmastiff stock without input from either Bulldog or Mastiff; cross-bred animals could not be registered. The

American Kennel Club The American Kennel Club (AKC) is a 501(c)(4) nonprofit breed registry, registry of purebred dog pedigree (animal), pedigrees in the United States. In addition to maintaining its pedigree registry, this kennel club also promotes and sanctions eve ...

recognised it in 1934.
It was definitively accepted by the

Fédération Cynologique Internationale The (; FCI; ) is the largest international federation of national kennel clubs and purebred registries. The FCI is based in Thuin, Belgium and has 98 members and contract partners (one from each country). History The FCI was founded in 1911 un ...

in 1955. In 1928, the

De Beers The De Beers Group is a South African–British corporation that specializes in the diamond industry, including mining, exploitation, retail, inscription, grading, trading and industrial diamond manufacturing. The company is active in open-pi ...

diamond mining company imported Bullmastiffs to South Africa to guard the mines.

Appearance

The Bullmastiff is a large dog. Bitches stand some at the

withers Withers are the ridge between the shoulder blades of an animal, typically a quadruped. In many species, this ridge is the tallest point of the body. In horses and dogs, it is the standard place to measure the animal's height. In contrast, catt ...

, and usually weigh ; on average, dogs stand about taller and weigh more. The coat may be fawn, red, or brindle, in any shade; some limited white marking on the chest is allowed. The muzzle is black, becoming paler towards the eyes. The Bullmastiff is

brachycephalic Brachycephaly (derived from the Ancient Greek '' βραχύς'', 'short' and '' κεφαλή'', 'head') is the shape of a skull shorter than average in its species. It is perceived as a cosmetically desirable trait in some domesticated dog and ...

, flat-faced and short-muzzled, but this does not affect its breathing.Brachycephalic dogs
The Kennel Club.

Health

A 2024 UK study found a life expectancy of 10.2 years for the breed compared to an average of 12.7 for purebreeds and 12 for

crossbreeds A crossbreed is an organism with purebred parents of two different breeds, varieties, or populations. A domestic animal of unknown ancestry, where the breed status of only one parent or grandparent is known, may also be called a crossbreed though ...

. Health concerns within the breed include hip and elbow dysplasia, progressive retinal atrophy, bloat, and cancer, with a relatively high incidence of lymphoma and mast cell tumours. Bullmastiffs are prone to certain hereditary diseases, including: *

Hip dysplasia Hip dysplasia is an abnormality of the hip joint where the socket portion does not fully cover the ball portion, resulting in an increased risk for joint dislocation. Hip dysplasia may occur at birth or develop in early life. Regardless, it doe ...

, affecting 24.5% of individuals *

Elbow dysplasia Elbow dysplasia is a condition involving multiple developmental abnormalities of the elbow-joint in the dog, specifically the growth of cartilage or the structures surrounding it. These abnormalities, known as 'primary lesions', give rise to oste ...

, affecting 13.8% of individuals, *

Entropion Entropion is a medical condition in which the eyelid (usually the lower lid) folds inward. It is very uncomfortable, as the eyelashes continuously rub against the cornea causing irritation. Entropion is usually caused by Genetics, genetic factors. ...

hypothyroidism Hypothyroidism is an endocrine disease in which the thyroid gland does not produce enough thyroid hormones. It can cause a number of symptoms, such as cold intolerance, poor ability to tolerate cold, fatigue, extreme fatigue, muscle aches, co ...

affecting 2.8% of individuals, *

Lymphoma Lymphoma is a group of blood and lymph tumors that develop from lymphocytes (a type of white blood cell). The name typically refers to just the cancerous versions rather than all such tumours. Signs and symptoms may include enlarged lymph node ...

autosomal dominant In genetics, dominance is the phenomenon of one variant (allele) of a gene on a chromosome masking or overriding the Phenotype, effect of a different variant of the same gene on Homologous chromosome, the other copy of the chromosome. The firs ...

form of

progressive retinal atrophy Progressive retinal atrophy (PRA) is a group of genetic diseases seen in certain breeds of dogs and, more rarely, cats. Similar to retinitis pigmentosa in humans, it is characterized by the bilateral degeneration of the retina, causing progressi ...

is common in the breed. A mutation to the

RHO Rho (; uppercase Ρ, lowercase ρ or ; or ) is the seventeenth letter of the Greek alphabet. In the system of Greek numerals it has a value of 100. It is derived from Phoenician alphabet, Phoenician letter resh . Its uppercase form uses the same ...

gene is responsible. Bullmastiffs also are prone to ear infections.

References

{{Authority control FCI breeds Dog breeds originating in England Mastiffs

History

Appearance

Health

See also

References