A sliding glass dog door is a great solution if you would rather not cut a hole through one of the doors or walls in your home.
Most sliding glass dog doors are easy to install yourself and do not require a professional installer. Sliding glass doggie doors come in a wide range of sizes, everything from small sliding glass dog doors for toy breeds (and cats) to extra large and giant sliding glass dog doors for the largest of dog breeds such as Great Danes and Mastiffs.