Discount Dog Doors

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A dog door is a hinged flap set into a door, wall or window to allow cats to enter and exit a house on their own without needing a human to open the door, while offering a degree of protection against wind and rain entering the home.

 

The simplest dog doors are just weighted flaps, but these may be blown open or may rattle in the wind. A magnet on the flap can hold the dog door in place and allow access. Some flaps also have adjustable catches to restrict the opening of the dog door in one direction or the other - for example to allow the dog to come in, but not go out again.

 

More sophisticated dogdoors have electromagnetic catches that can detect a matching permanent magnet worn on the dog's collar that will unlock the flap as the dog approaches, thus preventing any other animals from using the flap and entering the house.