Unlike most add-on panels available through big box retailers, The Window Factory's all-in-one canine entry doors are crafted within the main body of the door for a clean, polished look both homeowners and pets can enjoy. The Window Factory Pet Door System comes in four sizes and is build into the glass panel or screen panel of our Monterey sliding patio door. This pet door system eliminates the need for a temporary panel insert that is less secure and unsightly.