My DD's cat has started peeing on her bed. DD moved to an apt from a large house last Sept and wonders if kittie is angry about losing a big house to run in. Her sister kittie did some bed peeing when they first moved, but she stopped months ago. Both cats are getting fat from lack of exercise (and, I say, from over-eating!) - and they're inside cats - too near train tracks to be allowed outside on their own.