hound

(noun) any of several breeds of dog used for hunting typically having large drooping ears. Synonyms: hound dog.

(noun) someone who is morally reprehensible. Synonyms: cad, bounder, blackguard, dog, heel. Example: "You dirty dog."

(verb) pursue or chase relentlessly. Synonyms: hunt, trace. Examples: "The hunters traced the deer into the woods." "The detectives hounded the suspect until they found him."