Help your large-breed pup get a paw in the door with the PelxiDor Performance Pet Doors Dog Door Wall Installation, X-Large. This wall-mounted dog door can be installed in many different types of walls and features a rust-proof aluminum tunnel connecting the inner and outer frames. It’s sized perfectly for pups who weigh between 100 to 220 pounds and features a heavy-duty construction—designed to be chew-proof and almost indestructible. The saloon-style panels are made with high-impact acrylic—crafted to prevent the need for costly replacement flaps. It includes an energy-efficient weather seal to help keep heat and cool air from escaping your home. The super-durable aluminum frame is also designed to stand up to chewing and chomping while blending nicely into your home’s decor. And for extra security, the door includes a lock, key and steel security plate. It’s a convenient way to let your paw-tner outside for some fresh air and healthy exercise!