Zonepets Pet Knitted Strawberries Diaper Sanitary Pantie Underpants Dog Physiological Pants Measure your dog carefully to make sure you choose the right size S: Waistline: 26-30cm / 10''-11.8'' M: Waistline: 32-36cm / 12.6''-14.2'' L: Waistline: 35-44cm / 13.8''-17.3''