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A cat flap lets your pet move around the house at its own pace, reducing stress for both you and your pet. However, installing a cat flap isn't an simple task. The preparation and the consideration are the key to success. Start by gathering your tools and other materials. Note the exact location of your flap on the door or wall. Location A cat flap allows your pet to go outside and explore, eat and play without you having to open and close the door each time. It also allows your cat to access their food bowl and litter box and prevents them from fighting.