A pet water dispenser may be configured such that water may fall or may flow along a surface. The pet water dispenser may include a water tank, a pump, a water supply pipe connected to the pump, and a water supply hole communicating with the water supply pipe. A water supply plate having an upper surface over which water supplied from the water supply hole flows and a plate support supporting the water supply plate to be above the water tank. The plate support may be an inclined surface or a vertical surface. When a large amount of water is pumped from the pump, water may drop directly from an edge of the water supply plate through a water guide back into the water tank. When a small amount of water is pumped, water may flow along an outer circumferential surface of the plate support to the water guide.