HotelPaw Shark Pet House with Removable Bed Cushion Mat for Dogs and Cats Comes in 2 sizes: small (15"x15"x15") or medium (20"x20"x15") Small size is good for cats and small dogs under 12 inches in length like Yorkies, Chihuahua, and Maltese. Medium size is good for small dogs under 17 inches in length like Pomeranian, Maltese, Bischon, Shih Tzu, and Fox Terrier. Enclosed design is perfect for pets who like to burrow. Great for small dogs or cats. Keeps pets warm and comfy. Removable Bed Cushion Mat and Non-Skid bottom