Petromalt Hairball Treats are an intestinal lubricant that helps relieve constipation, dry cough and occasional vomiting associated with hairballs. It is also a gentle laxative against the formation of hairballs. A tasty treat provides the same trusted formula for the elimination of swallowed hair and the prevention of hairballs. Feed one or two pieces daily as a treat along with regular brushing of the cat's coat.