Originally posted by ChrisH
For a while the tray was close to the wall and when using it she would scratch the wall too, so one day I put an old heater next to the wall and moved her tray forward a bit, and guess what, she scratches at the heater front instead! I have no idea what that is all about!
Several of mine scratch the wall next to the litter box, and darned if I know why!

I've got litter boxes of the covered and uncovered variety, and I have to be especially vigilant about keeping the covered one clean. Otherwise someone (usually Kiri) leaves a little reminder right in front of the box.