Hi there, welcome! And thank you for rescuing this bunny! He looks very clean and happy. 🙂
If you check out the “Rabbit Info” tab at the top of the page, there is tons of info on housing, diet, litter training, bunny proofing, etc. Petsmart employees often aren’t very informed on good rabbit care (but they will try to sell you a lot of things!). The most important things for now are to make sure he’s getting lots of grass hay (timothy is the most common), it’s the most important thing in his diet. I wouldn’t do any treats for a while as they can encourage buns not to eat hay. Then you can slowly introduce a high quality pellet, and gradually introduce some greens. Things like fruits and carrots should be treated as a treat and only fed in very small amounts occasionally (a short piece of carrot is like a snickers bar for a bunny). Do you know how old he is? Rabbits under 6 months or so should get young rabbit pellets, but after that they can transition to an adult formula.
Getting him neutered will help a lot with the spraying and grunting. If you search for “exotics vets” you can usually find someone who works with rabbits. You can also start litter training now though, by putting a litter box in the corner of his cage where he seems to toilet the most (most bunnies will pick a corner). Then fill the box with bedding and hay, and remove all the bedding from the rest of the cage. Anytime he pees outside the box, mop it up with a paper towel and put it in the box. His box habits might not be great until he’s neutered, but they will start to form!
As far as handling, I would recommend setting up his cage so you don’t have to pick him up to let him out for play time. Most rabbits hate being picked up, so if you have to do it multiple times per day he will start to learn to fear you and hands. I think he and your cat will get used to each other with time, but perhaps when he’s out for playtime you can put the cat in another room for now. You can have a squirt bottle to deter the cat if he gets to close or aggressive towards the bun.
Most cages you can buy at a pet store are too small for bunnies to be in, so an inexpensive solution is to attach an x-pen (wire puppy play pen) to the cage so he has a “front yard” to play in all the time. I like to use a sheet of vinyl flooring from the hardware store to protect the carpet. Then you can open it up for exercise in an even larger area. If you need to keep his space a bit smaller till he’s neutered, that’s OK.
Welcome again and congrats on the new bunny. 🙂 Does he have a name yet?
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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.