I feel like the way I expressed myself was misleading. I didn't mean to imply actual werewolf/vampire crossbreeding. I was thinking of a bog-standard one-or-the-other-not-quite-sure-which-one-yet, but who's more familiar with human company than that of their own kin. 
I was asking whether it would be possible/normal for singular wolves or vampires to live with a group of humans instead of a pack/coven.