Sliding glass dog doors are a great solution if you would rather not cut a hole through one of the doors or walls in your home.
Most pet doors for sliding patio glass doors are easy to install yourself and do not require a professional installer. Sliding door doggie doors come in a wide range of sizes, from small pet 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.
Also see Automatic Patio Door Openers. In just minutes you can convert your sliding glass doors to operate automatically for pets.