A police dog, also known as a K-9 (phonemic abbreviation of canine), is a
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. ...
that is trained to assist
police
The police are Law enforcement organization, a constituted body of Law enforcement officer, people empowered by a State (polity), state with the aim of Law enforcement, enforcing the law and protecting the Public order policing, public order ...
and other
law enforcement officers
A law enforcement officer (LEO), or police officer or peace officer in North American English, is a public-sector or private-sector employee whose duties primarily involve the enforcement of laws, protecting life & property, keeping the peace, a ...
. Their duties may include searching for
drugs
A drug is any chemical substance other than a nutrient or an essential dietary ingredient, which, when administered to a living organism, produces a biological effect. Consumption of drugs can be via inhalation, injection, smoking, ingestio ...
and
explosives
An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An exp ...
, locating
missing people
Missing People (previously known as National Missing Persons Helpline) is a national organisation in the United Kingdom that offers assistance to people who run away and/or go missing and their families. It is a registered charity under Englis ...
, finding
crime scene
A crime scene is any location that may be associated with a committed crime. Crime scenes contain physical evidence that is pertinent to a criminal investigation. This evidence is collected by crime scene investigators (CSI) and law enforcement. ...
evidence, protecting officers and other people, and
attacking suspects who flee from officers. The
breeds
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 ...
most commonly used by law enforcement are the
German Shepherd
The German Shepherd, also known in Britain as an Alsatian, is a German Dog breed, breed of working dog of medium to large size. The breed was developed by Max von Stephanitz using various Old German herding dogs, traditional German herding dog ...
,
Belgian Malinois
The Belgian Shepherd (), also known as the Belgian Sheepdog () or the Chien de Berger Belge, is a Belgian breed of herding dog of medium size. It is bred in four distinct varieties based on coat type and colour: the long-haired black Groenen ...
,
Bloodhound
The bloodhound is a large scent hound, originally bred for hunting deer, wild boar, rabbits, and since the Middle Ages, for tracking people. Believed to be descended from hounds once kept at the Abbey of Saint-Hubert, Belgium, in French it is ...
,
Dutch Shepherd, and
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 ...
.
In recent years, the Belgian Malinois has become the leading choice for police and military work due to their intense drive, focus, agility, and smaller size, though German Shepherds remain the breed most associated with law enforcement.
Police dogs are used on a
federal and
local
Local may refer to:
Geography and transportation
* Local (train), a train serving local traffic demand
* Local, Missouri, a community in the United States
Arts, entertainment, and media
* ''Local'' (comics), a limited series comic book by Bria ...
level for law enforcement purposes in many parts of the world. They are often assigned to what in some
nations is referred to as a K-9 Unit, with a specific handler, and must remember several verbal cues and hand gestures. Initial training for a police dog typically takes between eight months and a year, depending on where and how they are trained, and for what purpose. Police dogs often regularly take training programs with their assigned handler to reinforce their training. In many countries, intentionally injuring or killing a police dog is a criminal offense.
History
Early history
Dogs have been used in law enforcement since the
Middle Ages
In the history of Europe, the Middle Ages or medieval period lasted approximately from the 5th to the late 15th centuries, similarly to the post-classical period of global history. It began with the fall of the Western Roman Empire and ...
. Wealth and money was then tithed in the villages for the upkeep of the
parish constable A parish constable, also known as a petty constable, was a Law enforcement agency, law enforcement Police officer, officer, usually unpaid and part-time, serving a Civil parishes in England, parish. The position evolved from the ancient ''headboroug ...
's
bloodhound
The bloodhound is a large scent hound, originally bred for hunting deer, wild boar, rabbits, and since the Middle Ages, for tracking people. Believed to be descended from hounds once kept at the Abbey of Saint-Hubert, Belgium, in French it is ...
s that were used for hunting down
outlaw
An outlaw, in its original and legal meaning, is a person declared as outside the protection of the law. In pre-modern societies, all legal protection was withdrawn from the criminal, so anyone was legally empowered to persecute or kill them. ...
s. The first recorded use of police dogs were in the early 14th century in
St. Malo,
France
France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...
, where dogs were used to guard
docks
The word dock () in American English refers to one or a group of human-made structures that are involved in the handling of boats or ships (usually on or near a shore). In British English, the term is not used the same way as in American Engli ...
and
piers Piers may refer to:
* Pier, a raised structure over a body of water
* Pier (architecture), an architectural support
* Piers (name), a given name and surname (including lists of people with the name)
* Piers baronets, two titles, in the baronetages ...
. By the late 14th century, bloodhounds were used in
Scotland
Scotland is a Countries of the United Kingdom, country that is part of the United Kingdom. It contains nearly one-third of the United Kingdom's land area, consisting of the northern part of the island of Great Britain and more than 790 adjac ...
, known as "Slough dogs" – the word "Sleuth", (meaning
detective
A detective is an investigator, usually a member of a law enforcement agency. They often collect information to solve crimes by talking to witnesses and informants, collecting physical evidence, or searching records in databases. This leads the ...
) was derived from this. Between the 12th and 20th centuries, police dogs on the
British Isles
The British Isles are an archipelago in the Atlantic Ocean, North Atlantic Ocean off the north-western coast of continental Europe, consisting of the islands of Great Britain, Ireland, the Isle of Man, the Inner Hebrides, Inner and Outer Hebr ...
and European continent were primarily used for their tracking abilities.
The rapid urbanization of
England
England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...
and France in the 19th century increased public concern regarding growing lawlessness.
In
London
London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...
, the existing law enforcement, the
Bow Street Runners
The Bow Street Runners were the law enforcement officers of the Bow Street Magistrates' Court in the City of Westminster. They have been called London's first professional police force. The force originally numbered six men and was founded in 1 ...
, struggled to contain the crime on their own, and as a result, private associations were formed to help combat crime. Night watchmen were employed to guard premises, and were provided with firearms and dogs to protect themselves from criminals.
Modern era

One of the first attempts to use dogs in policing was in 1889 by the
Commissioner
A commissioner (commonly abbreviated as Comm'r) is, in principle, a member of a commission or an individual who has been given a commission (official charge or authority to do something).
In practice, the title of commissioner has evolved to incl ...
of the
Metropolitan Police of London,
Sir Charles Warren. Warren's repeated failures at identifying and apprehending the
serial killer
A serial killer (also called a serial murderer) is a person who murders three or more people,An offender can be anyone:
*
*
*
*
* (This source only requires two people) with the killings taking place over a significant period of time in separat ...
Jack the Ripper
Jack the Ripper was an unidentified serial killer who was active in and around the impoverished Whitechapel district of London, England, in 1888. In both criminal case files and the contemporaneous journalistic accounts, the killer was also ...
had earned him much vilification from the press, including being denounced for not using
bloodhound
The bloodhound is a large scent hound, originally bred for hunting deer, wild boar, rabbits, and since the Middle Ages, for tracking people. Believed to be descended from hounds once kept at the Abbey of Saint-Hubert, Belgium, in French it is ...
s to track the killer. He soon had two bloodhounds trained for the performance of a simple tracking test from the scene of another of the killer's crimes. The results were far from satisfactory, with one of the hounds biting the Commissioner and both dogs later running off, requiring a police search to find them.
It was in
Continental Europe
Continental Europe or mainland Europe is the contiguous mainland of Europe, excluding its surrounding islands. It can also be referred to ambiguously as the European continent, – which can conversely mean the whole of Europe – and, by som ...
that dogs were first used on a large scale. Police in
Paris
Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of ci ...
began using dogs against roaming criminal gangs at night, but it was the police department in
Ghent
Ghent ( ; ; historically known as ''Gaunt'' in English) is a City status in Belgium, city and a Municipalities of Belgium, municipality in the Flemish Region of Belgium. It is the capital and largest city of the Provinces of Belgium, province ...
,
Belgium
Belgium, officially the Kingdom of Belgium, is a country in Northwestern Europe. Situated in a coastal lowland region known as the Low Countries, it is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeas ...
that introduced the first organized police dog service program in 1899. These methods soon spread to
Austria-Hungary
Austria-Hungary, also referred to as the Austro-Hungarian Empire, the Dual Monarchy or the Habsburg Monarchy, was a multi-national constitutional monarchy in Central Europe#Before World War I, Central Europe between 1867 and 1918. A military ...
and
Germany
Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...
; in the latter the first scientific developments in the field took place with experiments in dog breeding and training. The German police selected the
German Shepherd Dog
The German Shepherd, also known in Britain as an Alsatian, is a German breed of working dog of medium to large size. The breed was developed by Max von Stephanitz using various traditional German herding dogs from 1899.
It was originally b ...
as the ideal breed for police work and opened up the first dog training school in 1920 in Greenheide. In later years, many
Belgian Malinois
The Belgian Shepherd (), also known as the Belgian Sheepdog () or the Chien de Berger Belge, is a Belgian breed of herding dog of medium size. It is bred in four distinct varieties based on coat type and colour: the long-haired black Groenen ...
dogs were added to the unit. The dogs were systematically trained in obedience to their officers and tracking and attacking criminals.
In Britain, the
North Eastern Railway Police were among the first to use police dogs in 1908 to put a stop to theft from the docks in
Hull
Hull may refer to:
Structures
* The hull of an armored fighting vehicle, housing the chassis
* Fuselage, of an aircraft
* Hull (botany), the outer covering of seeds
* Hull (watercraft), the body or frame of a sea-going craft
* Submarine hull
Ma ...
. By 1910, railway police forces were experimenting with other breeds such as Belgian Malinois,
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 ...
s, and German shepherds.
Training
Popular dog breeds used by law enforcement include the
Airedale terrier
The Airedale Terrier (often shortened to "Airedale"), also called Bingley Terrier and Waterside Terrier, is a dog breed of the terrier type that originated in the valley (''dale'') of the River Aire, in the West Riding of Yorkshire, England. It ...
,
Akita,
Groenendael,
Tervueren,
Malinois dog,
Bernese Mountain Dog
The Bernese Mountain Dog, or , is a large dog breed originating from the canton of Bern, Switzerland and the Swiss Alps. It is one of four Sennenhund-dog type, type breeds, with ancestral roots in Ancient Rome, Roman mastiffs. The name ''Berner ...
,
Bloodhound
The bloodhound is a large scent hound, originally bred for hunting deer, wild boar, rabbits, and since the Middle Ages, for tracking people. Believed to be descended from hounds once kept at the Abbey of Saint-Hubert, Belgium, in French it is ...
,
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 ...
,
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 ...
,
Bouvier des Flandres
The Bouvier des Flandres is a herding dog dog breed, breed originating in Flanders, Belgium. They were originally used for general farm work including cattle Drover (Australian), droving, Livestock guardian dog, sheep herding, and dogcart (dog-dr ...
,
Briard
The Briard () or (; plural: ''Bergers de Brie'') is a French breed of large shepherd dog, traditionally used both for herding sheep and to defend them. It was first shown at the first Paris dog show, in 1863; the first Briard to be registered ...
,
Cane Corso
The Cane Corso is an Italian dog breed, breed of mastiff. It is usually kept as a companion dog or guard dog; it may also be used to flock guardian, protect livestock. In the past it was used for hunting large Game (hunting), game, and also to c ...
,
Bullmastiff
The Bullmastiff is an English breed of dog of mastiff type and large size, with a solid build and a short muzzle. It was developed as a guard dog in the nineteenth century by cross-breeding the English Mastiff with the now-extinct Old English ...
,
Croatian Sheepdog
The Croatian Sheepdog is a dog breed from Croatia.
Description
Appearance
The Croatian sheepdog is of low to medium height and the base color is always black, although there may be very small patches of white on its chest and/or toes.
A chara ...
,
Doberman Pinscher
The Dobermann is a German breed of medium-large working dog of pinscher type. It was originally bred in Thuringia in about 1890 by Louis Dobermann, a tax collector. ,
German Shepherd
The German Shepherd, also known in Britain as an Alsatian, is a German Dog breed, breed of working dog of medium to large size. The breed was developed by Max von Stephanitz using various Old German herding dogs, traditional German herding dog ...
,
German Shorthaired Pointer
The German Shorthaired Pointer or is a German breed of continental pointing dog of Braque type. It originated in the nineteenth century in what is now Germany. It is of medium size, and is an all-purpose gun dog suitable for hunting and retrie ...
,
Golden Retriever,
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 ...
,
Rottweiler
The Rottweiler (, , ) is a breed of domestic dog, regarded as medium-to-large or large. The dogs were known in German as , meaning Rottweil butchers' dogs, because their main use was to herd livestock and pull carts laden with butchered mea ...
and
English Springer Spaniel
The English Springer Spaniel is a breed of gun dog in the Spaniel group traditionally used for flushing and retrieving game. They are descended from the Norfolk or Shropshire Spaniels of the mid-19th century; the breed has diverged into sepa ...
,
Dogo Argentino
The Dogo Argentino (plural Dogos Argentinos) is an Argentine list of dog breeds, breed of large dog of mastiff type. It was selective breeding, bred in the early twentieth century in Córdoba, Argentina, Córdoba in central Argentina, primarily ...
.
Training of police dogs is a very lengthy process since it begins with the training of the canine handler. The canine handlers go through a long process of training to ensure that they will train the dog to the best of its ability. First, the canine handler has to complete the requisite police academy training and one to two years of patrol experience before becoming eligible to transfer to a specialty canine unit. This is because the experience as an officer allows prospective canine officers to gain valuable experience in law enforcement. However, having dog knowledge and training outside of the police academy is considered to be an asset, this could be dog obedience, crowd control, communicating effectively with animals and being approachable and personable since having a dog will draw attention from surrounding citizens.
For a dog to be considered for a police department, it must first pass a basic obedience training course. They must be able to obey the commands of their handler without hesitation. This allows the officer to have complete control over how much force the dog should use against a suspect. Dogs trained in Europe are usually given commands in the country's native language. Dogs are initially trained with this language for basic behavior, so, it is easier for the officer to learn new words/commands, rather than retraining the dog to new commands. This is contrary to the popular belief that police dogs are trained in a different language so that a suspect cannot command the dog against the officer.
Dogs used in law enforcement are trained to either be "single purpose" or "dual purpose". Single-purpose dogs are used primarily for backup, personal protection, and tracking. Dual-purpose dogs, however, are more typical. Dual-purpose dogs do everything that single-purpose dogs do, and also detect either
explosives
An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An exp ...
or
narcotic
The term narcotic (, from ancient Greek ναρκῶ ''narkō'', "I make numb") originally referred medically to any psychoactive compound with numbing or paralyzing properties. In the United States, it has since become associated with opiates ...
s. Dogs can only be trained for one or the other because the dog cannot communicate to the officer if it found explosives or narcotics. When a narcotics dog in the United States indicates to the officer that it found something, the officer has probable cause to search whatever the dog alerted on (i.e. bag or vehicle) without a warrant, in most states.
In suspect apprehension, having a loud barking dog is helpful and can result in suspects surrendering without delay.
Specialization
Police dogs can be specialized to perform in specific areas.
*Apprehension and
attack dogs – This dog is used to locate,
apprehend, and sometimes subdue suspects.
*
Detection dog
A detection dog or sniffer dog is a dog that is trained to use its senses to detect substances such as explosives, illegal drugs, wildlife scat, semen, currency, blood, and contraband electronics such as illicit mobile phones. The sense most use ...
s – Trained to detect
explosive
An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An ex ...
s or drugs such as marijuana, heroin, cocaine, crack cocaine, or methamphetamines. Some dogs are specifically trained to detect firearms and ammunition.
* Dual purpose dog – Also known as a patrol dog, these dogs are trained and skilled in tracking, handler protection, off-leash obedience, criminal apprehension, and article, area and building search.
*
Search and rescue dogs
A search-and-rescue (SAR) dog is a dog trained to respond to crime scenes, accidents, missing persons events, as well as Natural disaster, natural or Disaster, man-made disasters. These dogs detect human scent, which is a distinct odor of skin f ...
(SAR) – This dog is used to locate suspects or find missing people or objects. Belgian Malinois, German Shepherds, Golden Retrievers, Labrador Retrievers, and Bloodhounds can all be used.
Retirement
Police dogs are retired if they become injured to an extent where they will not recover completely,
pregnant
Pregnancy is the time during which one or more offspring gestation, gestates inside a woman's uterus. A multiple birth, multiple pregnancy involves more than one offspring, such as with twins.
Conception (biology), Conception usually occurs ...
or raising
puppies
A puppy is a juvenile dog, generally one less than 12-18 months old.
Puppies are markedly underdeveloped and dependent on their mothers at birth (displaying '' altriciality''), but healthy puppies grow quickly and begin walking thereaft ...
, or are too old or sick to continue working. Since many dogs are raised in working environments for the first year of their life and retired before they become unable to perform, the working life of a dog is 6–9 years.
However, when police dogs retire in some countries they may have the chance to receive a pension plan for their contribution to policing. In 2013, a pension scheme for police dogs in
Nottinghamshire
Nottinghamshire (; abbreviated ''Notts.'') is a ceremonial county in the East Midlands of England. The county is bordered by South Yorkshire to the north-west, Lincolnshire to the east, Leicestershire to the south, and Derbyshire to the west. Th ...
,
England
England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...
was introduced, wherein the police force offered £805 over the span of three years to cover any additional medical costs; the dogs were also allowed to be adopted by their original handler.
In many countries, police dogs killed in the line of duty receive the same honors as their human partners.
Accusations of brutality and racial partiality
A 2020 investigation coordinated by the
Marshall Project
The Marshall Project is an American nonprofit news organization covering the U.S. criminal justice system. The organization's mission is to impact the system through journalism, and states that its goal is to create and sustain a sense of nation ...
found evidence of widespread deployment of police dogs in the U.S. as
disproportionate force and disproportionately against people of color. A series of 13 linked reports found more than 150 cases from 2015 to 2020 of K-9 officers improperly using dogs as weapons to catch, bite, and injure people. The rate of police K-9 bites in
Baton Rouge, Louisiana
Baton Rouge ( ; , ) is the List of capitals in the United States, capital city of the U.S. state of Louisiana. It had a population of 227,470 at the 2020 United States census, making it List of municipalities in Louisiana, Louisiana's second-m ...
, a majority-Black city of 220,000 residents, averages more than double that of the next-ranked city,
Indianapolis
Indianapolis ( ), colloquially known as Indy, is the List of capitals in the United States, capital and List of municipalities in Indiana, most populous city of the U.S. state of Indiana and the county seat of Marion County, Indiana, Marion ...
, and nearly one-third of the police dog bites are inflicted on teenage men, most of whom are Black. Medical researchers found that police dog attacks are "more like shark attacks than nips from a family pet" due to the aggressive training police dogs undergo. Many people bitten were not violent and were not suspected of crimes. Police officers are often shielded from liability, and federal civil rights laws don't typically cover bystanders who are bitten by mistake. Even when victims can bring cases, lawyers say they struggle because jurors tend to love police dogs.
Usage by country and region
See also
*
Detection dog
A detection dog or sniffer dog is a dog that is trained to use its senses to detect substances such as explosives, illegal drugs, wildlife scat, semen, currency, blood, and contraband electronics such as illicit mobile phones. The sense most use ...
*
Dogs in warfare
Dogs have a very long history in warfare, beginning in Domestication of the dog, ancient times. From being trained in combat, to their use as scouts, sentries, Courier, messengers, mercy dogs, and Tracking (dog), trackers, their uses have been ...
*
Nosework
*
Working dog
A working dog is a dog used to perform practical tasks, as opposed to pet or companion dogs.
Definitions vary on what a working dog is, they are sometimes described as any dog trained for and employed in meaningful work; other times as any ...
References
References
Works cited
*
External links
National Police Canine Association(US)
United States Police Canine AssociationThe North American Police Work Dog AssociationLos Angeles County Police Canine Association US
Virginia Police Canine AssociationUS
American Working Dog Association
{{DEFAULTSORT:Police Dog
Working dogs
Dog, Police