I have put my dome litterbox inside another plastic box - one with low sides. Any last bits of litter that sneak out of the dome get caught in the outside box. So much less cleaning that way!

Look at your local discount or hardware store for the right size box - mine is for a Christmas wreath. As long as the outside box has low sides (4 to 6 inches would work) your cat won't have any problem getting to the litter pan. And, in my opinion, the litter box inside the other box doesn't look any worse than the litter box by itself!

I know I have mentioned this idea before - but it just has made my life SO much easier!!!!!!!