That’s stressful. 🙁 I’ve had a few foster bunnies that freaked out over my cat, whereas other’s don’t mind at all. How long have you had the kitten? More time might be the best solution, as even the buns I fostered that initially were very afraid of my cat eventually got used to him. I think short term, best is to help keep the kitten away from the bun’s cage so the bun doesn’t feel threatened. Adding a hide box within the cage or covering part with a blanket might also help the bun feel less vulnerable.
I don’t think this should impact the bonding with the new bunny. If the new bunny is more bold, it actually might help. I’ve witnessed the buns that were more afraid of my cat realize they could stand up to him after watching my fearless bunny chase the cat away.
Also how does the kitten behave towards the bun? It’s kind of a vicious cycle if the bun is afraid, because cats like to chase. So as long as the cat isn’t actually trying to catch the bun, it can help to pet the bun and keep them calm when the cat approaches. If the bun doesn’t run, chances are the cat won’t chase. Then the bun learns they don’t have to run, etc. Of course this is a dif story if the cat is actually trying to hunt the bun. Might be hard with a kitten as they just want to pounce on everything, but at least at this point the kitten is small so maybe you bun will learn to boss him around a bit. 😉
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.