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A cat flap lets your pet leave and enter the house at their own pace, which reduces stress both for you and your feline companion. However, installing a cat flap isn't an easy task. Preparation and consideration are the most important factors to success. Gather your tools and materials. Mark the exact location of your flap on the door or wall. Location A cat flap lets your pet to go outside and explore, eat and play without having to open and close the door every time. It also allows your cat to access their food and litter