When I say they are 'litter box trained' I didn't necessarily mean they use the litter box for peeing/pooping. HA HA HA. I have no idea why but every litter so far (four of them) have really loved the litter box for sleeping in. In all honesty they do use it about 80% of the time, and 10% of the time their front feet are in, but not the important end, and 10% they blatantly disregard the box. They like to see me scrubbing on my hands and feet!