(Sergeant's) Sentry Petromalt Hairball Relief is a laxative product to help eliminate and prevent hairballs in cats and kittens over 4 weeks of age. Feed a 1/2” strip of Petromalt per 4.4 lbs. body weight. For treatment, give orally once daily for 3-4 days. For prevention, give orally 1 to 2 times per week. Very palatable formula. Contains 10.8% mineral oil and 32.8% petrolatum.