I know I will probably catch flak for this (and I certainly don't expect to change minds) but I've been working with some of the behaviorists here at the vet school and I was amazed to find out how different the domestic dog's hierarchy is compared to the wolf. The lady I was studying under mentioned several times that a common mistake (which has been perpetuated by Caesar Milan I think) is thinking you have to be alpha. She explained that there is a difference between alpha and respect. In domestic dogs, you see a whole different social system that is very different from the wolf's. You don't start seeing "alpha" behavior in dogs until they begin to revert back to feral behavior, and even then it's usually more a hybrid of the two.
She said a lot of the issues she deals with are referrals after owners have tried the alpha thing on their dogs and it backfires. After seeing some of the training in action, I can totally see how this makes sense.
When we give a dog such a domestic setting to live in, we can't expect them to act (or respond) like their wild ancestors. I also find "alpha" training to be particularly more dangerous.
I have some time this week and can look for more articles on this. I'm actually curious myself, because although I agree that domestic dogs behave very differently than wolves, I don't have a lot of knowledge about the studies done to show this.