The glass fitting Dogwalk dog doors have several features that other brands do not have. All glass fitting models require a round cut out which makes it much easier for glaziers to install. The glass fitting Dogwalk dog door was the first door of its type. Now available in four models so there is a model to suit most glazing applications whether it be single or double glazing. It has the added feature of the flap being able to swing much higher, which takes the stress away from the hinge and the flap. Manufactured from high impact polycarbonate. A more recent addition to the range is the intermediate glass fitting dog door, also available in four models.