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A cat flap allows your pet to enter and leave the house at will, reducing stress for both you and your pet. However installing a cat flap isn't an simple task. Planning and preparation are the key to success. Start by gathering your tools and materials. Mark the exact position of the flap on your wall or door. Location A cat flap allows your pet to explore, eat and play without having to open or shut the door each time. It also gives your cat access to their cat's food and litter box which helps keep them from arguing over