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A cat flap allows your pet to leave and enter the house at his own pace, reducing stress for both you and your cat. However, installing a cat flap is not an simple task. The key to success is proper preparation and careful consideration. Begin by gathering your tools and other materials. Mark the exact location of the flap on your wall or door. Location A cat flap allows your pet to explore, eat and play without needing to open or close the door each time. It also gives your cat access to their cat's litter box