Since I have 6 cats, I have 6 covered litterboxes. They are "large" because of my 18 pound cat Casey. The reason I have covered litterboxes is because of Mollie Rose who likes to dig to China when covering her business. It does cut way down on the amount of litter that's thrown outside the box. There is one brand called Booda which is large.

The name of the boxes I use are Van Ness and they come in large and huge, and can be found in pet stores or online at www.petco.com They are reasonably priced too. The Booda box runs about $35.00.

I will NEVER go back to uncovered litterboxes again.