I tried doing that but it doesn't work at all. My rabbit thinks the entire cage is his litter box since he's allowed to run about in the house most of the time. The problem lies in the fact that when I'm not home, he has to stay in his cage. And I don't want him stepping in his piss. I tried putting wire mesh, trays, etc... He refuses to use them. He would pee around it or stick his butt out and piss outside. -.-"

I've been trying to train him for over a month now... tried almost all the methods I found and read up on... but it still doesn't seem to work on him. Sigh.