Vet is one of the few words, with more than one meaning, that is almost always viewed in a positive light. We like people who take care of animals, and we like people who take care of the bad guys. In fact, the only kind of vet we don’t like is the kind that is a vet of fighting for Hitler, and maybe the vet who treated his dog.
MITTENS: Of which war?
HOBO: Not that kind of vet.
MITTENS: Why do you hate the brave men and women who defend our country?
MITTENS: It's because you're just like all those other liberal professors, isn't it?
HOBO: If I were, I wouldn't want cruelty to animals!