Your Bunny Rabbits may have free run of the home. As soon as he uses the box consistently, you can give him some freedom. Place one or more large litterboxes in corners of the running area outside the cage. Urine-training requires only that you give them a place they know will not be invaded by others.
Older rabbits are at least as easy to train as are younger rabbits.
Generally, rabbits are easier to litter train and are more consistent in using their litter boxes than cats are. Alfalfa or oat-based litters or litters made of citrus products can be used. These litters provide excellent odor control and will do no harm if the bunny nibbles on them. However, if a rabbit eats too much of the grain-based litters, they may experience bloating. As urine accumulates, the rabbit will opt for the food dish.