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Start by feeding them and playing near the cat flap. This will help them become familiar with the sound it makes when it opens and closes. It also helps when you apply your cat's scent to the flap. Next, prop the flap open a little to give your cat a sense of movement. Try to lure them in by presenting their favorite treat or toy. Certain plants (such as clary sage, cat germander and valerian) have an enticing aroma that cats love. Installing the flap for cats A cat flap lets your cat to go and come whenever it wants without having to open the door