The award-winning clevercat top entry litter box nearly eliminates tracking, prevents over-the-edge spills and reduces odor. Excellent for cats that love to dig and kick litter. Clevercat is dog-proof from most dogs. Cats and kittens adapt quickly and love the privacy. Not recommended for disabled, elderly or very large cats. Litter box measures 20-inch x 15-inch x 15-inch with a 9-inch diameter entry.