A police dog is a dog that is trained specifically to assist police and similar law-enforcement personnel with their work. They are also known in the United States as police K9s (a play on words; a homophone for canine).
The term is also sometimes used in the common parlance of several countries to refer to any German Shepherd Dog because of the long history of the use of the German Shepherd by the police and military; in some nations German Shepherds are the only dogs used by those forces. In the post-industrial era German Shepherds have often been depicted as police dogs in television, movies and police dog memorials. This breed is often still used, as are Rottweilers and a few other breeds.
Chasing and holding
Most often, police dog refers to a dog who has been trained to guard their handler and to find, chase, intimidate, and hold suspects who are attempting to elude the police. Modern police dogs are not vicious animals; most are trained to enjoy their work, with chasing and grabbing introduced to them as tricks or games that can be played only when the handler (a police officer) gives the appropriate command. The dog's goal is not to bite; it is to grab and hold on at all costs until the handler gives the release command. This means that the dog grabs hard, and a fleeing suspect can be bitten when attempting to avoid or fight off a dog and the dog is attempting with full speed and energy to grab the suspect. Most handlers, if possible, give the suspect a verbal warning that the dog will be set loose if they do not immediately halt, and this is often sufficient deterrent that the dog is not needed.
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