The Catgenie is the best litter box ever, but sometimes my babies don't like the dome. I think it needs to be taller because they feel claustrophobic. I have an Abyssinian who weighs 7 lbs. and if it wasn't for the dome she would do a pole vault and spread litter across 2 rooms. But I also have a Maine Coon Cat who weighs 16 lbs. and doesn't like the dome most of the time, so I also have to use a regular litter box with flushable litter (corn litter) and she tends to use both.