Virtually dog proof. Prevents litter-tracking No over-the-edge mess. Use any type litter. Odors reduced. Cats adapt quickly and easily. Cats and kittens LOVE the privacy! MORE INFORMATION Size: 20"L x 15"W x 15"D 9" diameter opening Built-in tracking mat is flat removable lid Heavy duty plastic Light gray color Clevercat® Products Proudly Made in the USA!