Aggressive behavior towards cat. Need help!

[aurelia]

Hi, so I seem to have a problem with my bunny and 2
cats. My bunny was growing up with a cat that passed away so when I introduced 2 new kittens (she was still young) everything went great and smooth. My kittens now cats never were agressive towards the bunny and my bunny was getting along with cats just fine for a year and few months. She and both my male cats are sterilized/castrated. So the thing is my bunny suddenly started to attack one of my cats and its been getting worse ever since. She is friends with one and attacks the other. Cat never attacks back just runs away. They can sit next to each other and eat treats with no problem or they can lay across the room seeing each other and still be fine and later aggressively attack and bite him if he is walking by or just chilling on the floor. I am super frustrated at this point since it has been going on for months. I recently (one month ago) rehomed my bunny to my sister and her two bunnies. They bonded and became best of friends with hers one female and one male bunny. And then a month later she started to attack the female rabbit while still being friends with the male. They tried to rebond them and take them on rides together but it didn’t work and got worse with time. At the end a week after the fightning started we had to separate them. Now the bunny came back home today and once again went back to her original behavior. Attacking and biting the cat. (She is free roaming usually but in my room for now but cats can still enter.) She isn’t afraid of anything, very brave/dominant personality and is healthy, eating, pooping, running around. She is scheduled for a vet visit (bunny specialist) 2.january to be checked and eliminate anything medical even though I highly doubt that it’s medical. The next step will be to re-home her to a different family, I don’t want to do that and would rather keep her with me or my sister but we can’t have her go around and terrorize other animals. Maybe someone here has an answer on how to handle this situation. She is otherwise very sweet and loving bunny with amazing personality that everyone adores and loves. She’s been in the family for some time now and it breaks my heart to even consider giving her away.

[Asriel and Bombur]

Girl buns, even when spayed, can be still territorial over their space. It sounds silly for her to be territorial with one cat and not the other, but it can happen.vits really hard to say what would be causing it specifically, aside from maybe just being scared of her and lashing out out of fear.
I know minimizing her space sounds mean, but when you get another pet and you’re trying to make them all happy, sometimes you do what you have to do. That being said, can you give her a designated bunny room or have her in an xpen setup while she’s near the cats that way the one she’s bullying can be safe?
Why would you rehome your bunny when you’ve had her the longest out of them, it doesn’t seem very fair to her. Not trying to sound rude, I’m just honestly wondering why the cats would take precedent. If I ever got a second pet that had issues with my boys, the second pet would be gone in a heartbeat. I couldn’t see doing that to a pet that’s been with me for so long. That’s basically like you couldn’t adjust to these new creatures, so they can stay and you can’t. With bunnies so many things can set them off, even if they were previously familiar with it. My boys were raised around 2 dogs at the breeder. 2 years later we moved into a shared house that has 3 pugs and my boy Az is absolutely terrified of even the smell of them to the point where I have to wash my hands if I’ve touched one. Bunnies are inherently prey animals and cats are predators, and maybe he can sense that in the one she’s bullying. It’s hard to say.

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