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Install a cat flap if you want your pet to go and come whenever they like without having to open the front door. You should hire a professional to install the flap. They can help you navigate the complexities of putting various types of cat flaps into various walls and doors. Installation With a cat flap, your pet is able to enter and out of the house at any time without having to open the door. There are a variety of pet flaps available that range from microchip-reading doors to fully insulate