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Introduce your cat to the flap prior to the installation to allow them to be familiar with the dimensions and shape. The flap should be opened and let your cat explore it from every angle. Make sure the cutout is square and even. 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 flap inside your home is beneficial for the well-being and health of your pet. This is because it lets the pet to move freely between indoors an