The original formula that cats love! This hairball relief remedy is a longtime favorite of even the finickiest of cats…in a savory malt flavor. SENTRY Hairball Relief helps relieve the constipation, dry cough and the occasional vomiting associated with hairballs. This product uses Petromalt technology, and is an intestinal lubricant that helps prevent the formation of hairballs and eases the passage of hair that is ingested. It is safe and effective for cats and kittens over 4 weeks of age.