Exactly. Expecting dogs to be pack animals like wolves, after 30,000 years of divergent evolution to be dependent on humans, isn't all that different to expecting humans to behave like chimps (OK, that may be true in an uncomfortable number of cases, but you get what I mean).
There is no dominance hierarchy when groups of dogs are found in the wild, and they're highly cooperative and rarely aggressive, but they will gravitate towards human settlements. Basically, they recreate the harmonious version of human social structure when left to their own devices.
Despite a lot of the hate for dogs I can see here, I always wonder if we could learn a lot from them....