I can so relate to this! I have 2 cats that live upstairs because of the monster of a dog who lives on the main floor. No matter how much we tried she always thought chase the kitty was fun. To which she was clawed bloody...didn't stop her. She does have a Chihuahua friend, who is smaller then the cats I might add. We recently had a stray adopt us. So she is in the basement. She will venture to the main floor and oddly monster dog is easier on her. But she also slips right through the gate we have and goes upstairs. Where she is promptly growled at.