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A cat flap is a great option to give your pet the freedom to roam and ease the burden of getting them out and in. It can also help your pet to be less anxious and will stop them from entering the home when they are not welcomed. To set up a cat flap, measure the distance from the bottom of the cat's stomach to the floor. Mark a line along the door panel. Make use of a spirit-level for checking whether the line is straight. 1. The type of door It is recommended to speak with a professional