Abstract: A toilet seat and training system specifically designed for cats. The instant seat includes a circular sitting member having a center orifice therethrough, a wide platform formed on opposite sides thereof so a cat can be well balanced thereon, and a series of concentric annular tray members attached to an inner rim of the sitting member and formed having progressively smaller sizes, and which can be successively removed to vary the size of the center orifice, and is designed to releasably attach to an existing toilet and fit underneath a human toilet seat, so people can still have use of their toilet seat without interference from the cat's seat. This seat can be used in conjunction with specialized dissolving litter, a pet urine odor eliminator, and a urine detector light.