Police dog

dog used by the police (for following scent trails, etc.)

A police dog is a dog that is trained specifically to assist police and similar law-enforcement personnel with their work. They can also be known as a K9 unit (a homophone for canine), this is especially prevalent in the United States.The term is sometimes associated with German Shepherd dogs because of the long history of the use of the German Shepherd by the police and military for public order enforcement (and some forces use German Shepherds exclusively).
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Noun
1. any dog trained to assist police especially in tracking
(hypernym) working dog

police dog
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