Yes, you can litter train now. Some unfixed rabbits will pick it up, some won’t. End of the day, don’t expect perfection over night, or generally. Wick is neutered and very obedient, but he’ll still poop to mark new places he’s never been before or pee when he’s mad at me.
You will need to be patient and go at her comfort pace, not your projection of what you think it should be. If she’s not comfortable outside the cage yet. just give her time. Rabbits are weary of slippery surfaces, which may add to the discomfort, but most eventually try it out and get used to it. Putting a few rugs may help the process, so she can run from one place to another easily.
You should separate the cat and rabbit, and speak to a rabbit experienced vet about flea prevention. There are flea products out there, but some are safe for cats/dogs yet toxic for rabbits, so it’s important you’re getting your information from a RABBIT EXPERIENCED AND SAVVY veterinarian.
One note: Don’t be surprised if your rabbit ends up being a male. Sexing a rabbit at a young age is difficult, as the skin, fur, etc.. both blocks the view and has not fully developed into its desired shape.
Very important note: Get a rabbit-savvy vet, and take her in for a general check-up. Additionally, a rabbit vet will be able to give you a briefing on proper diet and care. The basics, which are vital, are on this site, in the BUNNY INFO section.
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.