Unique stretchy fabric provides comfort and mobility so your dog can move around freely.Fur-safe, repositionable fasteners provides a snug, comfortable and secure fit. Leak-proof barriers and the super absorbent core will keep your floor and furniture dry. Tail hole and extra long wings help diapers stay put on the wiggliest of dogs. Wetness indicator changes color when wet. Medium size is good for dogs 25-50 lbs with waist measurements of 15" to 23".