Zonepets Dot Cherry Pet Diaper Sanitary Pantie Girl Dog Physiological Pants Apparel Measure your dog carefully to make sure you choose the right size S: Waistline: 20-30cm / 7.8''-11.8'' M: Waistline: 25-35cm / 9.8''-13.7'' L: Waistline: 30-40cm / 11.8''-15.7''