My three buns are housed in a 4 story condo made from NIC cubes. The second story of the condo has been an ongoing battleground for pee wars. The floor was plywood, then I changed it to coroplast, and it had a faux sheepskin over it (the rubber backed kind). I think this floor of the condo is Deanna’s personal domain, because there is a small litter box on this level that she really likes. She likes to sit in it and pick hay out of the top of the hay rack that is on the first floor. Every couple of days, one or more of the bunnies would pull the sheepskin out of a corner and pee there. If I moved the litterbox, they’d pee where the litterbox used to be. It was very frustrating, I’d have to wash the sheepskin twice a week. About two weeks ago, I got rid of the sheepskin and replaced it with one of those BusyBunny grass mats. Since then, there was only one pee incident, and that was over a week ago. I have no idea why, but the sheepskin was an invitation to pee. Maybe the pee smell never got totally washed out?