Do you make custom size pet doors? We can provide custom size pet doors for doors, walls, French doors, and patio doors. You can get a custom size pet door ranging from cats to Great Danes. The custom cat door or dog door will be a flap door, specially tailored to your needs. Call our customer service at 800-749-9606 or e-mail firstname.lastname@example.org with your requirements. We will need to know the size of the hole where you want your custom door to fit, and if it’s through a door or a wall. We are available Monday through Friday from 10:00 AM to 4:00 PM.