Zonepets Floral Ruffles Lace Princess Pet Diaper Sanitary Apparel Girl Dog Physiological Panties Measure your dog carefully to make sure you choose the right size S: Waistline: 21-34cm / 8.2''-13.4'' M: Waistline: 28-46cm / 11''-18.1'' L: Waistline: 32-52cm / 12.5''-20.5''