This multi-functional Penn-Plax Litter Box Enclosure includes an inside top shelf and top storage drawer, and features cat shaped entrances on the two sides so your cat or kitten can easily get in and out. It's perfectly sized to fit a small cat bed or small litter box (both sold separately, not included with this purchase). The finished built cat litter box enclosure measures 18.5 in. D x 20 in. W.