Pecute Dog Screen Door Safe Plastic Flap Locking Door with Telescoping Frame White 11-by-13.38 Inch Medium Size Easy installment, firm and durable ABS PC material, suitable for cat and medium size dog, lockable door so you can lock the door White dog door. Perfect size for your medium size pet Frame Dimensions: 34*28*2.2cm (13.38*11.02*0.87inch) This comes packed perfectly in a white box complete with plenty of instructions to easily install the doggie door Before installing there are instructions to tell you to measure the belly height of your dog so that fits your dog better to go in and out