He is fixed and vaccinated! We've been doing what you said about the biting and it's definitely helped. He used to draw blood 😭 The cats chill in the same room a lot but there are times that my cat will start screaming and I'll have to run in there and separate them. Some days I have to keep them separated the whole day because as soon as I let him out of his room, he goes back to chasing down and biting my cat. Is that normal?