It is possible to house train two (or more) rabbits that live together to use a litter tray, using the rabbits’ natural clean instinct to have a single toilet area.
Rabbits that are not neutered or spayed, may be difficult to toilet train. This is because using several different toilet areas is territorial behaviour, and rabbits that are not neutered or spayed display more territorial behaviour than rabbits that are neutered, particularly male rabbits.
This behaviour can happen even more when two rabbits live together if both rabbits are not neutered or spayed. This could make it very difficult or impossible to house train the two rabbits together.
To begin house training two rabbits together, place a litter tray in the areas that the rabbits usually uses as their toilet area. If the rabbits use different toilet areas, place a litter tray in each. Leave some of the rabbits’ dirtied bedding and pellets in the litter tray(s) so they get the idea.
If possible, you could block off part of the cage so that each rabbit is enclosed in a small area with its litter tray for a while. Put lots of hay at one end of the litter tray so the rabbit can sit and munch, and let nature take its course.
Once the two rabbits have got the idea of using the litter trays, you can gradually begin to move the litter trays to where you want. You may be able to move the litter trays next to each other, and eventually combine them so both rabbits use the same litter tray.
If one rabbit stops using the litter tray as it gets closer to the other, move them a little further apart again, and gradually repeat the process.
The next stage of the house training process is to begin gradually moving the rabbits’ litter tray to where you want it to be, just a small distance each day. Make sure that your rabbits always have access to the litter tray, or they will not use it.