Zonepets Pet Diaper Sanitary Panties Girl Dog Polka Dot Cake Skirt Strap Physiological Pants Measure your dog carefully to make sure you choose the right size S: Waistline: 34cm / 13.4'' Back: 25cm / 9.8'' Suitable for pets: 1.1-3.3 lb M: Waistline: 38cm / 14.9'' Back: 29cm / 11.4'' Suitable for pets: 4.4-6.6 lb L: Waistline: 45cm / 17.7'' Back: 33cm / 12.9'' Suitable for pets: 7.7-9.9 lb XL: Waistline: 50cm / 19.6'' Back: 36cm / 14.2'' Suitable for pets: 11-14.3 lb