Dog Door for Sliding Glass Doors - 74.8" to 80.7" Height Adjustable Pet Door with Security Lock. Give your small or medium dog independent access to the outdoors with this height-adjustable pet door, designed to fit most standard sliding glass doors from 74.8" to 80.7" with a 5.9" adjustment range. The 16.1" H x 10.2" W pet opening provides comfortable access for breeds like Beagles, Corgis, and French Bulldogs. The insert-style design installs directly into your sliding door track with no cutting or drilling-perfect for apartments, rentals, and patios. An included sliding track lock keeps the insert securely in place while allowing your sliding door to remain locked for added security. A magnetic flap opens smoothly and snaps shut automatically after each use, blocking drafts, wind, and debris while giving your pet the freedom to come and go. Convenient, secure, and renter-friendly. Color: White.