Unleash Your Pet's Inner Explorer: Give your pets the freedom they deserve with eillion's large dog door for walls! Perfect for both dogs and cats, our wall dog door lets them come and go as they please, eliminating the hassle of scratched doors and constant barking to get out. Enjoy greater peace of mind knowing your furry friends can safely explore the outdoors and return home whenever they want. Perfect for Large Pets: Our premium aluminum doggie door for walls features an expandable tunnel, fitting walls 4.1 to 7.1 inches thick. It requires a simple cutout of 11.2" x 18.1". The flap, measuring 10.2" x 15.6", comfortably accommodates pets up to 100 pounds. Includes a cutting template and clear installation instructions.