A litter-based flush toilet for cats based on a modified flushing rim commercial service sink made of vitreous china equipped with an added moveable drain plug. The sink tramway is modified to lower the water level below the level of the drain plug, resulting in a dry bowl between flushes. The plug prevents flushable biodegradable litter from prematurely entering the drain and provides a safety factor for inquisitive digging cats. The commercial plumbing version has a conventional commercial flushing valve and lever, either hand or foot operated. The residential version has an oversized conventional toilet tank complete with flush handle and flapper valve. To flush, the pet owner activates the actuator to dislodge the cover from the drain and flushes the pet waste and absorbent material down the drain. The user then replaces the plug and refills the bowl with about an inch of fresh litter.