All wolves are under the Marrok. It's like a tier system. You have your individual packs and alphas, but the Marrok is the most dominate wolf is over sees all. Though he doesn't always pay attention to individual packs unless they catch his attention. 

So the pack that is coexisting with the vampires could be flying under the radar. 

I shouldn't be as busy this afternoon Either so I should be able to write Adams reply too. :)