IntimaTe WM Heart IWMH 4-Piece Set Puppy Dog Diaper Sanitary Pants Washable Underwear Panty Female Girl for Small Breeds Dog Diaper For SMALL Breeds. PLEASE measure you pet! Size S:best for small dogs and puppies, waist size 5.9. Made of nice soft cotton, Washable and reusable. Mesh design,cool and cosy. Perfect for female pets experiencing excitable urination, incontinence, and being in season. Pet's underwear can help to stop your doggie from peeing in the house.