About Our Pet Bed Cover:Walks give paws and coats the chance to get dirty, so you want an easily washed cover for their beds. Ours is tough, tightly woven twill to really last - and to stand up to claws. It s finished with piping trim and has an easy-sliding, reinforced zipper to conveniently remove the cover. Use with inserts (sold separately). Small: 26""x20""x4"" Medium: 36""x28""x4"" Large: 44""x34""x4"" Extra Large 52""x39""x4"".