My lot have laways had trouble with litter trays. They never seem big enough (often they will squat in the tray but poo over the edge!), plus the litter goes all over the floor. The other day I dumped their old trays and replaced them with underbed storage boxes. Much, much better!! They are twice as big and are twice as tall so plenty of room for them to poop and none of the litter comes over the sides!:thumbup: I would highly recommend then for large or messy cats..