Abstract: A pet accessory is provided for use with a commode which rests on top of a conventional commode and is held thereon by downward protrusions which prevent horizontal displacement. The accessory has a trap door arrangement which can be controllably operated for purposes of discharging waste material. Encircling the trap door arrangement is a perforated tube into which water is fed via an electromagnetic valve for purposes of flushing the aforesaid waste material into the commode. The trap door arrangement is controlled automatically by a sensing device which senses that a pet has been on and departed from the trap door arrangement. This sensing device is in the form of a light source and photoelectric cell combination which also controls the electromagnetic valve. A ramp is provided for access to the pet accessory.