I introduced my Benji to the cats straight away really. I mean, he is in the main room of the house, so I couldn't really keep the cats out, it is their home too.
My cats haven't harmed him, but they will give him a whack if he approaches them too fast and they don't like it. It startles them, so they kind of just tell him to back off. I think it is largely due to size though, they won't try attack him because he is bigger than them as a giant, they are quite scared of him. One of the cats hisses at him because she doesn't like the way he runs after her. :lol: Them whacking him doesn't really seem to phase Benji though, because he continues to do it. If it hurt him, he would obviously not go near them anymore.
Before we got April, Benji was absolutely desperate to snuggle up with our cats, but they weren't having any of it. They just swat him away. :lol:
April is a different story though. Because she is a normal sized rabbit, the cats do see her as prey, and I have seen one of them trying to hunt her. They'd never catch her as she's too fast, and I'm always there or Benji protects her, she hides behind Benji and the cats leave her alone.
When I first got her, they were a pain for trying to watch her and hunt her, so I kept them out of the room, but now they don't bother. A couple of them (I have five cats) follow her when she's in the bushes sometimes, but they do that with both of the rabbits, they never actually pounce or anything. They have learned now that they aren't allowed to hunt her, I think they just like pretending to hunt more than anything. They seem to hang around a lot more outside when the rabbits are outside.
My advice would be to let the cat in but only supervised, if it tries to chase your rabbit, stop it or spray it with some water. I know cats hate water, but they have to learn not to do it. I personally, have a little activity pen thing meant for kids, and if one of the cats tries to hunt April, I put them in there for 5 or 10 minutes to teach them not to do it.