In some animal groups, yes (like humans); but as far as I know, not in wolves. There may be some challenging views, but it is far from disproven entirely. Some of the anecdotes people have shared with "tame" wolves seem to back the idea of a pecking order.
Quite the opposite - the wolves was where it was disproven most thoroughly, by observation of packs in the wild (and noticing that they're nothing like packs in captivity).