This stylish litter box from IRIS USA comes in several different colors to match a variety of decors. The Orange/Brown and White/Beige were the best-sellers for Prime Day last year. It also comes in two sizes and you have the option of a filtered lid (litter drops back inside) or a grooved lid (litter is trapped in grooves). This top seller box is an Amazon's Choice product. The top-entry box is great for keeping nosy dogs out of the litter and the rounded shape makes scooping clean up easy.