Kitty and Ace are fighting alot. I don't know what to do with them. Kitty is 7lbs. and Ace is 3.9lbs. Kitty has been attacking him all the time. I am trying to keep them seperate but I feel that I'm not spending enough time with either one. Kitty has always gotten along with other dogs. What should I do? Kitty has been through obedience school and passed with flying colors. She always minds me except when it comes to Ace. She really wants to kill him. Any suggestions? I'm afraid if this keeps up Ace will have to find a new home.