An improved structure of a feeder for supplying water and pet food is disclosed. Therein, a base has a shifting space adjacent to a side of a bowl settled in the base so as to receive a dispensing controller. A container unit equipped with a hopper and a water supplier is provided on top of the dispending controller. The dispensing controller can be shifted in the shifting space so that an opening limit is formed when projections formed on two rear ends of the dispensing controller abut against blocks provided bilaterally in the shifting space, and a closing limit is formed when a groove of the dispensing controller abuts against a stop plate formed at a rear section of the shifting space. Thus, the container unit can be easily opened to dispense pet food or closed to not dispense pet food.