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If you want to allow your pet to move around as they please without having to open the door, you can put in a cat flap. You should hire an expert to install the flap. They can take care of fitting various types of cat flaps onto different walls and doors. Installation With a cat flap, your pet can come in and out of the house at will, without needing to open the door. The variety of pet flaps on the market is vast, from microchip-proof and bite-proof doors to fully lined cat flaps. They come with a range of different materials and frames including PVC or plastic