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Introduce your cat to the flap before it's put in place so that they be familiar with the size and shape. Open the flap and let your cat explore it from every angle. Make sure the cutout is even and square. Mark the screw holes on your door and align them with the opening for the cat flap - the distance between the edges must be the same. Preparation Installing a cat-proof flap in your home is beneficial to the health and well-being of your pet. This is because it allows the pet to move freely between indoors and out without having to allow them to enter or exit.