Plexidor dog doors are chew-proof – guaranteed. We have applied many of the features from our commercial kennel doors used by the military and police worldwide to bring you a virtually indestructible dog door. Plexidor's hardened acrylic panels are saloon style and do not require costly replacement flaps. The hardened aluminum frames coordinate beautifully with your appliances, interior walls, or hardwood floors. Each Plexidor includes a cylinder lock, key, and steel security plate. The door can be locked every night and the steel security plate can be attached while you're away for an extended period of time. Plexidor performance pet doors are extremely energy efficient. Each time you open the door to let your dog out, your heating and cooling escapes. Installing a Plexidor dog door can save you money! On average, homeowners have reported an annual savings of 10% off their energy bill. Plexidor performance pet doors are manufactured in the USA and come with 5 years limited residential warranty. Need help to find a local installer?