To keep litterboxes outside the cage in place, first get two litterboxes just alike that will stack inside each other. I use the small Van Ness rectangular cat pans. I put a small screw through the side of the first pan and into the base board. Then the second pan sits inside the first so it can be easily removed for cleaning. I also put a piece of plastic carpet runner underneath for those near hits. Even Lucy, who overturns everything, hasn't managed to turn the pan over when it's fastened down this way. Terri [Posted in FML issue 3603]