Of my nine furballs I can tell you that none of them use the litter box the same way. I have one that will dig almost to the floor boards and cover his completely. Then Sammy walks around the top edge like some kind of circus performer, finally gets in and does his business, then back up on the edge to cover it. Of the three females two of them get in, do their thing, and run like heck! They don't cover anything! Poor silly Leroy gets in does his business and scratches and scratches and scratches and scratches some more on the side of the box! He has never covered anything. He will get out and look inside and see that it isn't covered and start scratching some more. Finally Sammy can't take it anymore and he jumps in and covers it for him if I don't get there first!! Then we have Lucky...he will get in and pee, jump out and poo on the floor right beside the box!!! They all have their own bathroom quirks! I don't think I will ever get that figured out. It's just one more cat mystery!!