I adopted these two cats two years ago from SPCA, they were 7 months and 1 yr old, respectively. They were not related, but were in same colony. The boy cat kept growing and now he is twice her size (I think he may be part Bengal). He will sometimes attack her, he goes right for the neck, and when she has had enough, thtime cat fight, hissing and howling begins. Often at night when I’m asleep. I will have to rescue my female cat when this happens, and he knows he is in trouble, and I will squirt him with water. We have a catio, so sometimes he will run out the pet door, or go hide under the bed in guest room ( where he usually hides, he is afraid of everything). I live in Nevada so letting them outside is a risk as we hav coyotes. But he is getting on my last nerve with this aggression. I’m thinking he is trying to assert his dominance towards her or something. Otherwise, they get along, they sleep together sometimes and lick each other. With weather colder, they don’t go out to catio as often, so I’ve been trying to play with him daily so he can burn off some energy. But tonight, that didn’t help as before I was even asleep he attacked her again and I had to squirt him. And yes, when these attacks happen, fur is flying..her fur! I worry he is going to really hurt her. Any suggestions on how to stop this? I’m about ready to throw him outside. I’m a lifelong cat Mom, but this is first time I’ve had cats that couldn’t go outside.