I have a year & a half old wolf dog that has been a very good pet with me as his pack leader. Recently he's found he can push the other two dogs (+ - 70 pounds each) around and is becoming more agressive with them. One has taken to living in the bathroom to stay away from him. Even when he's playing with them, he plays to dominate. He's also trying to displace my older, favorite dog and has begun fighting with him when they play ball together. Any suggestions as to how to handle this new found agression? Not with me, as I won't tollerate any challenge, but with the other dogs? I feed him last, make him sit before he gets fed, etc. but don't know how to hande the agression with the other dogs. PS. I'm gone to work all day, so there'll be a lot of interaction I won't be able to monitor.