I have been fostering 2 rabbits for about 5 weeks now but one of them just will not use the litter box consistently. My understanding is that they were at the shelter for around 4 months and the trainers were unable to successfully litter train them. They thought it was because of other rabbits nearby, but after moving to my place, the rabbit still misses the litter boxes all the time. He is about 4 years old and he is neutered. The vets find him to be healthy. I keep them together in 2 exercises pens combined to create a large one. Their trainer and I have tried so many different things- switching up the litter type, moving the boxes towards the accident area, using a larger litter box but it's still useless. About half the poop & pee goes out of the litter boxes every day, mainly in front of the litter boxes but also some further away. I currently am using a regular sized litter box and a large litter box that is actually for puppies (with an opening that is easy to enter), and I fill them with BOXO comfort small animal bedding. I try to scoop the soiled litter at least twice a day because I notice more and more accidents as the day goes on, so I thought the litter box was too dirty, but it does nothing. He still chooses to pee right outside the litter box with new litter. I pick the poo up/soak the pee up and put it in the litter box a few times a day. I've even caught him just as he was lifting his tail to pee and herded him into the litter box but he just hopped back out to do his business. Their trainer is running out of ideas so I was wondering if anyone here might have any more suggestions. Thanks in advance.