I'm not blaming it on the neutering, I'm just say his was very friendly with other dogs and people before his neutering, and EXTERMLY aggressive afterwards. He's extremly stubborn. I don't know how to get him to stop being so stubborn, and maybe to get him to like me more than my dad becasue my dad didn't want another dog in the first place, and Kiki is very attached to him, and no one else. Is there anyway I can work the stubborness out of him?