heh, ours often miss... one of them digs a neat hole in the middle and widdles just off the edge. i have newspaper around the tray and that just gets burned. i have a clay based litter, the one that sinks the pee to the bottom when you shake the tray so even with four cats shut in overnight [on main road; had our own tragedies] you only need to change it every three to seven days [dependant on weather during day; one ALWAYS comes in to use the tray rather than peeing outside the others only do in bad weather]. the advertising says you change it every two to three weeks, well i guess they didn't test it on cats as wet as ours; we have four tray. i spade out poos and flush them; or burn the rather liquid ones of our elderly persian. a few stones of lit go down the loo fine because we have good old fashioned victorian plumbing which actually even takes newspaper in judicious quantities with the er stickier offerings. does anyone else have a crazy feline who comes in to use the tray? and has anybody else ever had a cat that pees down the bath plughole? that's a GREAT saving on lit, so long as you remember to rinse the bath every morning lol!