The Cornell Feline Health Center describes a hairball, more formally known as a trichobezoar, as a clump of undigested hair moistened by digestive fluids. When a cat grooms itself, its rough tongue picks up the loose hairs from their coat, and the cat then swallows them. Most of the time, the hair passes through the cat’s digestive tract without a problem. Sometimes, though, the hair piles up in the cat’s stomach and keeps food from passing…