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Allow your cat to enter and leave your house without a cat flap. This allows your pet to have freedom of movement and encourages exercise in order to prevent obesity and relieve boredom. Some of them also work on wall installations. They will start by marking the position of the door and drilling around the corners. How to install a cat flap A cat flap lets your pet to go out without opening a door or window. This is useful if you're working late, or if you're concerned about your cat being left in a seclud