First, our dog (big lab) is a consummate cat box cleaner. Very gross. And she makes a mess of doing it-litter scattered everywhere, etc.Now she can't get into the cat box! First problem solved! Second, the cats get rid of a lot of the litter on their paws inside the box before they even get out so our litter mess has been minimized. Finally, it was super easy to put together and looks like an inconspicuous piece of furniture. It's attractive. While it is pricey, for us it was worth it! My cats had no problem using it, including my very 'large bones' girl. So, cats big and small will have no problem.