Abstract: A pet door employing a pair of flaps secured to a frame installed in an opening in a door or wall. Each flap is hinged at the top to the frame so that the flap opens away from the frame. An outwardly angled flange extends around both sides and the bottom of each flap. The flange allows a pet to nuzzle open the flap located on the side of the frame from which the pet is approaching. Once the pet has opened the first flap, the pet opens the opposite second flap by pushing against it. The angled flanges prevent a pet from being trapped between a flap and the frame of the pet door. Optionally, weights may be provided on the flaps to aid in closing the flaps, and the frame may be provided with a gasket to further seal the flaps with the frame.