DESC: When cats clean themselves, their tongues often pull loose hair from the coat. When swallowed, it can accumulate in the gastrointestinal tract. This 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 cat's coat will generally eliminate these problems.