Well, wolves and dogs are very much the same, dogs are pretty much just domesticated canines we've screwed with through selective breeding. That's why people sometimes sell wolves, either accidentally or not. (My most amusing run-in with one was a surprisingly dumb domesticated wolf. He was nice, but man, he did NOT have it all upstairs. Might have had something to do with being stuck on a fence when it got hit by lightning, though.)
And then if the wolf has no pack to run with, and these funny look wolves come around, and they're friendly, well... there's your new pack!