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A cat flap is a great option to give your pet some freedom 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 aren't welcome. To put up a cat flap to install a cat flap, measure the distance from the bottom of the cat's stomach to the floor. Mark a line along the door's panel. Make sure the line is straight using a spirit level. 1. The kind of door It is recommended to speak with a professional if you want