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Start by feeding them and playing near the flap. This will make them familiar with the sound it makes when it closes and opens. You can also add your cat's smell to the flap. Then, let the flap open a little to give your cat an impression of movement. Try to entice them by holding their favorite food or a toy. Certain plants (such as cat germander, clary sage and valerian) have an enticing aroma that many cats love. Installing the cat flap A cat flap enables your pet to come and go as it pleases without opening the door