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If you wish to let your pet to go and come whenever they want without having to open the door, you can install a cat flap. You should hire a professional to install the cat flap. They can handle the complexity of fitting different kinds of cat flaps to various doors and walls. Installation With a cat flap, your pet can come in and out of the house at any time without having to open the door. The range of pet flaps on the market is huge, from microchip-proof and bite-proof doors to fully in