Give your small dog or cat the freedom to come and go with this adjustable dog door for sliding glass doors, featuring a sturdy aluminum frame and tempered glass panel that seamlessly integrates with your patio door. Designed for easy, tool-free installation, it simply slides into most standard door tracks and adjusts in height from 75 7/8"" to 80 11/16"", making it an ideal, non-permanent solution for renters and homeowners alike. The upgraded hinge-structure flap stays flexible and functional even in low temperatures, while the metal cover and secure locking mechanism help you control access and keep your pet safe when needed. With a generous flap size of 8 1/4"" x 12 1/4"", this medium model (CWM03-m) offers a comfortable passage for small dogs and cats, combining durability, convenience, and a clean, modern look in one reliable pet door.