Final answer:
Dogs in law enforcement originated in Belgium and later spread to England and the United States.
Step-by-step explanation:
The official use of dogs in law enforcement originated in Belgium. In the late 19th century, the Belgian police force started training dogs to assist in tracking criminals and finding hidden weapons. This practice then spread to other countries, including England and the United States. However, it wasn't until the early 20th century that dogs became widely utilized in law enforcement, particularly with the establishment of the first K9 units in New York in the 1920s.
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