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Begin by feeding them and playing near the flap. This will make them familiar with the sound it makes when it opens and closes. It is also helpful to apply your cat's scent to the flap. Then step is to open the flap a little to give your cat a sense of movement. Try to lure them in by holding their favorite treat or an item toy. Certain plants (such a cat germander, valerian, clarysage, and clary sage) are attractive scents that cats are known to love.