How do I train my bunny to use the litterbox?
Provide a litterbox of appropriate size within your bunny’s environment. Put hay in the box (over the litter) to give him something to do in there. If he spends enough time in the box, he will pee in it. That will establish it as his toilet. If he has an accident elsewhere and seems to prefer to do his business in another location, either move the box there or give him a second one. Especially for a spayed or neutered bunny, the process will take very little time.