Abstract: A pet toilet for use indoors having an automatic cleaning feature. The pet toilet is attached to conventional household drains. The animal stands or sits on a flexible foraminous platform, thereby deflecting it, and relieves itself. Some of the waste passes through the holes in the platform. After the animal leaves, a sensor detects that the flexible platform has returned to its normal level and water is automatically introduced to a level above the level of the platform. An ultrasonic transducer emits ultrasonic waves which clear the platform and other areas of the toilet.