An animal actuated drinking fountain has an electronic circuit for operating a pump to supply water to an animal. The fountain has a housing with a container for holding the water. A pump receives water from the container and has an upward directed discharge port for creating a fountain of water. A light emitter and light sensor are positioned so a beam of pulsed light is positioned above the surface of the water in the container. When the animal interrupts the beam of pulsed light, electronic circuitry causes the pump to turn on and create a fountain of water for the animal to drink.