A cat litter composition, which is absorbent, odorless, trackless and biodegradable, comprising about 60-94% by weight absorbent, about 1-35% by weight gypsum, and about 3-12% by weight water. The composition is pelletized so that it may easily be disposed of by flushing it down the toilet. This is particularly desirable when the composition is used as a cat litter.