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Fitting a cat flap in the door will allow your pet to move around whenever they want. Follow the steps below to find out how to mark the shape, cut it using a jigsaw/hole saw and install your cat's flap. You can stop wild animals, pests and stray cats from gaining access to your cat's area by using a manual Four-Way Lock. It's also a good idea to keep a few pots of plant around for your cat to hide in. Placement A cat flap can be used to keep animals from entering such as rodents or cats.