WizSmart's NEW Ultradry Disposable Diapers feature a super comfortable fit with tail hole, easy open/close system, and ultra absorbent materials! Our leak-proof diaper design is perfect for females in season, incontinence, excitable urination, travel, and more. Size XS ideal for dogs < 8lbs with a 8-13" waist Size S ideal for dogs 8-14lbs with a 11-18" waist Size M ideal for dogs14-28lbs with a 14-23" waist Size L ideal for dogs 28-44lbs with a 15-26" waist Size XL ideal for dogs 44-75lbs with a 17-29" waist