thank you everyone for your suggestions and I am sorry that I haven't responded to each person individually but here are my replies all in message. Yes Sunny is neutered and Missy the persian is spayed. She is very much a cat with an attitude and doesn't like to be bothered with him at all. She can be nasty at times so I can't understand why she doesn't defend herself with him. she just growls at him. thye do have food down all the time time and they do have 2 litter boxes. I think he is just trying to show his dominance over her. I just bought him a collar with a bell but i am not sure that it will be of any help but at least maybe it will alert us that he is chasing her and we can intercept. I am hoping that now that the weather is nicer and they can go out in our screenhouse they will get along better. it is funny, she can be in the screenouse all day with my daughters cats and they don't bother her at all and she tolerates them. But for some reason when then come over to our house, sunny is terrifed of them and he hides but he isn't terrified of her. Quite the contrary. Maybe if she would fight back, he wouldn't be so dominant over her. thanks for all the suggestions.