Actually, movie wargs don't really look a whole lot like Andrewsarchus to me. They seem more like hyenas. An Andrewsarchus's head looks a lot weirder. (the really long snout, mostly). Yes, I do know what this thing is. (Mesonychid from the late Eocene epoch of Mongolia, to be exact.
)
But anyway, I think the Weird Mutant Hyena Things mostly fight out of hunger, so throw 'em a few dog treats and you'll be fine. Of course, if you just stay out of their way for a while, they'll probably all jump off a cliff for absolutely no reason and save you the trouble.