Though mind you, even against animals, vengeance is rather useful; because even animals can model humans to some extent. The wolves in The Jungle Book learned to "seven times never kill Man", after learning that to hurt one man, means many other men with guns coming to kill wolves in return.

Beware fictional evidence. I suspect that wolves might be smart enough in individual cases to recognize humans are a big nasty threat they don't want to mess with. But that makes sense in a context without any understanding of vengeance.