It’s a challenging situation with the splayed legs and being a year old already, but with patience you can retrain him I’m sure. I actually don’t think being outside is good for him, especially while trying to train him, so as a rep. of a house rabbit forum, I want to assure you that he would be perfectly content with a life spent indoors. Cutting down (off?) the side of the litter pan was the right thing to try, and that should help with his leg trouble getting in and out of any litter pan.

You want to follow the suggestions made here, and he will learn litter habits better if he is more confined for a short time until he learns it. He can be in the xpen and run around for supervised periods. When you see him waiting to go, or lifting his tail, scoop him up and set him into the litter pan with lots of praise. Praise him if he goes in it, and give him a little treat, like a pellet or a raisin. He wants to learn a positive association with both the litter box and the behavior that gets him there. Every time you see pee or poops outside the box, soak it with a paper towel or pick it up and put it into the litter box, so he will smell his own scent in there, too. With easy access and positive reinforcement, he should catch on soon. Also, be sure he likes the type of litter you use. He may find it too rough if his legs are sensitive, so try a soft shaving, like Aspen shavings (never Pine shavings) or a soft paper like Carefresh. It just may feel better to him and be attractive, like the ground has been. Be sure he isn’t cramped in too small a box, and set it in any corner he’s chosen.

If you need advice on disabled rabbits, the HRS at http://www.rabbit.org is a good source of info. Also, Cats, Rabbits & More is a website with a whole section devoted to care of disabled and geriatric rabbits. Might find some good tips there for bunnies with splay. I checked out those sources when my senior bunny Spockie had lost use of his back legs. This was years ago and before I found the BB site.

Adding on to what Pam said – as it is important for him to associate his litterbox with his pee/poo.    So, do you have a way to put any of his pee and poo from where he went outside? I know you said he waits until he goes outside, but does that mean he both pees and poos outside? (the pile type poo, not the marking random poos).  

What kind of litter do you use? Some bunnies are sensitive to certian textures or scents. How are his feet? Any sore hocks that would make it a bit more uncomfortable if he is stepping on pelleted litter? 

You may need to confine him in the house to a pen until he masters his litter box habits and then gradually allow more freedom as he gets it. Does he use his litter box as his bed? You said you put poops in his box but it may be helpful if you soak up some urine with a paper towel and put part of the soaked paper towel in the litter box. Is he neutered? Sorry if you stated this before.

Also, you said you have other animals and unfortunatley this can cause marking from your bunny, especially if he is newish to the home. Maybe once he gets used to this being his home and feels more secure he will mark less. But that really hard to say. Best to not let bad habits set in and confine to a xpen attached to his cage for a while….could be a few weeks and then supervise during further exploration and as soon as he lifts his tail to pee, escort him to the litter box and as soon as he pees there, give a treat.

You may have a bunny that will always pee on the couch. I had that same problem too. I was able to put a stop to it by being persistant for months about not letting him on the couch. As soon as he looked up and was prepping to jump, I would stop him and say no. If he jumped up, he would be immediately shooed off. I would pile up pillows to block him when I couldn’t watch him for a moment. Over time he just seemed to get that he wasn’t allowed. And then a couple years later I actually tried to see if he would come up on the couch and not pee. I actually put him up there a couple of times and he wanted no part of it. He’d jump right off. So he went from a bunny that would freely jump on the couch and pee and chew to avoiding itball together. Some bunnies do just fine and its great but for those that persist to pee and or chew, sometimes restricting access is the only solution.

Got a similar problem here. He is 6 months old, been trying to litter train him since he was 5 weeks old (thats when we got him)…total failure. He goes in his litter box and everywhere in his cage AND everywhere in our living room. He has some fav. spots so we tried putting the litter box in those areas…he would just ignore them and go to a different spot. We’d move it there, he’d go and mark his territory everywhere. It’s just the 3 of us here, and he chases me around a lot (my husband jokes about bunny seeing him as the rival :p). We tried multiple litter boxes. He just ignored. I don’t know what else to do but let him do what he does and clean up after him. He isn’t neutered (will be next month), so I’m hoping it will help a little then.

Priya,  in your case I think your bunny is driven by hormones since he is at 6 months.  Though it should improve after a month or so after surgery, its best not to let bad habits set in. Supervision and limiting access is still important.  Giving too much freedom too fast is not good for even newly adopted already neutered bunnies as they need to understand that their territory is separate from the shared neutral territory.