I must be very lucky then as mine use the litter tray all the time. Mind you, I have the wood shavings about 2 inches thick and thats about the height of the front of the litter tray. I dont bother with litter though, I just put wood shavings in it and clean it out twice daily, once weekly I wash it all out and put the wood shavings off the floor in the litter tray and put fresh shavings on the floor - kind of recycling I suppose. So far so good, lets hope it stays that way