Brands of dog and pet doors for windows include Thermo, Ideal, Hale and the Patio Pet Door Company. Each of these companies makes a variety of window pet doors. Typically, pet doors for windows install horizontally across an accessible window and have a flap to function as a door.
Ideal manufactures a broad range of aluminum sash pet window doors, ranging in adjustable sizes from a 23-inch to 28-inch model up to a 33-inch to 38-inch size. The window pet doors are designed to allow your cat or dog easy access to and from the house through an open window while still providing some security and comfort for the house.