Rabbits can be taught, re-taught to use a litter box, rabbits normally use one corner of their hutch/cage to poo in, if you get a litter box, and put some saw dust ectra in it
…, then get plenty of the rabbits poo and put it in the litter tray in the corner that the rabbit poos in, the rabbit should start to use the litter box and after a few weeks of the rabbit using the tray you should be able to move the litter tray to where you want and the rabbit will continue to use it. . (MORE)