I have trained a number of rabbits to use litter boxes, but my new boys are being difficult. I have two male Holland Lops, bonded brothers, neutered since December 2018. I pulled them out from under a house where the people were letting the rabbits breed, so they had been outside since birth. I had them neutered the next week. They do use the litter box, and I have their hay set up so they eat while in the litter box, but if there is anything else soft, such as wall-to-wall carpet, towel, area rugs, bunny bed or grass mats in the crate, or even loose hay in the crate, etc., they also pee on those. I have temporarily moved them into the garage to give me a chance to thoroughly clean my carpets, etc. and will start over in their crate. I like to let them out of their crate as much as possible when I am at home... but they are never far from their crate (no more than 10 feet), as I am trying to restrict their roaming until they are more pee trustworthy. I love the stubborn little brats. Sigh. Suggestions appreciated.