I have a large cat (18 lbs). He's a little on the chubby side, but mostly he is just BIG (tall and long). I was hoping this would work for him and my other, more dainty cat but the big cat could not comfortably maneuver inside of the box. The few times he tried to use the litter box inside of the enclosure, he missed the box itself and cat urine went into the bottom of the enclosure underneath the mat that I had put in there for protection (ha!). We eventually gave up on the enclosure and decided that looking at the litterbox was less troublesome than having to clean out the enclosure daily. I think this box could work well for people with smaller cats.