Petromalt Hairball Remedy is the original hairball remedy for cats and a favorite of cat owners for over 50 years. When cats clean themselves, their tongues often pull loose hair from the coat. When swallowed, it can accumulate in the gastrointestinal tract. The nearly indigestible material becomes a "hairball" which can interfere with normal digestion and elimination. Symptoms of hairballs include constipation, straining during a bowel movement, dry cough and vomiting after meals. The use of Petromalt and regular brushing of the cat's coat will generally eliminate these problems. Plus cats just love the malt taste. For adult cats and kittens over four weeks of age.