[chakras]

Can there be two Alphas to an protective, aggressive male Aussie?
He seems be territorial aggressive. He fence barks at other dogs and his quite angry at the mail man. Yet we can go to a dog park and he is an agel with other dogs and people.

I am defintely Alpha to this dog and the other dogs we have. My wife is afraid she is not enough of an Alpha to him and is fearful of him when he growls at her when he is chewing on a hoof. She feels she must challenge him and my experience has led me to another tactic. She wants to be an Alpha to him like she is to the others.
Advice is appreciated