the cloth item used to clog the uterus of a dog during the "heat" period. when a dog is going threw the gestation period she becomes bloody. this is not good for furniture, clothes or carpet. so to prevent the leakage one would use a dogpon. which is traditionally made of cotton,but if the user is allergic to such item it can get the rarer and more expensive shep skin dogpon.
justin was avery experienced dogpon changer, so much so that when lady anne (dog) was riding the cotton pony (on the menstral cycle) he how'd off his versatility by changeing the dogpon with his mouth.