A screen door is a good suggestion. We have made slight progress with them interacting as long as I WATCH Whisper constantly. If not, he attacks her...which lead to him getting scratched near his eye. She must have given him a good wolluping because he has been squinty for a few days. I took him to work and he doesn't have a scratch or anything on the eye itself...he just looks like Popeye. It's horrible to say but he had it coming. Bad meowmie!!!!