hound
noun.
any of several breeds of dog used for hunting typically having large drooping ears
Synonym: hound dog
noun.
someone who is morally reprehensible
you dirty dog
Synonym: blackguard, bounder, cad, dog, heel
verb.
pursue or chase relentlessly
The hunters traced the deer into the woods|the detectives hounded the suspect until they found him
Synonym: hunt, trace