Our cat Baby would never go in a regular pan, and even with a cover would either not go or pee all over the edge. We finally got a CleverCat litterbox- it looks like a rubbermaid container, about a foot and a half deep with a flat lid and a hole on one side of the top. Both the cats love it, although Lucy thought it was a play thing when we first purchased it. The only problem is that they only pee on the side with the hole for some reason, so if you don't clean it often enough one side is a big clump of pee...