Cesar millian says that when dogs greet you at the door its not from affection :(?

I also have to disagree. When my dog goes to the dog park and his buddies arrive, he is the first one down by the gate waiting to greet them when they come in. Once inside the park, both dogs usually are jumping, whining, and barking at each other as they romp around together. I think that they do indeed greet each other with affection.