Abstract: A pet bathing apparatus includes an inner casing defining a space for accommodating a pet and having a transparent door for entrance and exit of the pet, an outer casing provided outside the inner casing and spaced apart from the inner casing, and a base part including a support plate having openings and a net arranged on the support plate. A spray nozzle unit distributes water into the space and includes a plurality of fixed and rotary nozzles. A water supply unit includes a main tube coupled with a plurality of branch tubes, which are coupled with the spray nozzle unit, a water feeding pipe defining a water supply path to the main tube, and a container for supplying shampoo to the water feeding pipe. A drain unit collects and removes water, and a blowing unit provides air to the inner casing.