Dogs constantly like to go outside and come back in. Whether they want to go out to explore, spend time in the sun, or use the restroom, dogs go out a lot. This means they also have to come back in. If you do not have a dog door, this outside-inside dance can turn you into a doorman for your dog. Dog doors provide freedom for both you and your dog. Doggie doors can be used on storm doors, exterior walls, and sliding doors. Choose from single- to triple-flap systems with magnetic catches to ensure closure. Door flaps have expanding edges to create a seal against the weather.