yes, it is very easy to train a rabbit to a litter box. DO NOT USE CEDAR BEDDING! It can lead to respiratory problems. I use corncob litter. It's absorbent to an extent, so it will basically force you to clean the litter box. I would introduce the puppy to the bunny gradually. They'll become fast friends (we hope). If you're going to let it have free range, bunny proof your apartment. Get all electrical cords off the ground etc. And last and foremost, spay or neuter your new pet. Rabbits can get cancer in the reproductive system (especially females). Hope I informed you about something positive. Hehehe, luck to u and your new bun. ~meg~