Built for large dogs up to 100 pounds, this sliding glass pet door adjusts to fit door heights from 75 7/8 to 80 11/16 inches using a turn knob, with no drilling required for installation. The flap is made from a triple-layer PVC construction that stands up to scratching and daily wear from bigger dogs, while an inner insulating layer helps block outdoor heat, cold, and drafts from entering the home. A rotating hinge is built to hold up to frequent, heavy in-and-out traffic without loosening over time. For times when you need to keep your dog inside, at night, while you're out, or during storms, a slide-down blocking panel closes the opening in about a second, secured with a simple button lock. At 20.1 pounds, the unit installs and removes easily without tools, making it a good fit for renters who need a temporary, reversible setup.