Thank you for taking time in posting your feedback. We apologize for the inconvenience that you have experienced, but we are glad to learn you successfully installed the door. The large pet door measures 10.5 x 15.75 inches and fits pets up to 90 lbs. We have a storm door with small pet door designed for small pets wherein the flap measures 6.25 x 6.25 inches and fits pets up to 12 lbs. Rest assured that we will create a feedback about your comment. Please contact the Andersen Storm Door Solution Center at 855-337-8822 if you need assistance about your door. Please be ready with the serial number upon your call. - Noel