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A cat flap is an excellent method to allow your pet freedom and ease the burden of letting them in and out. It can also help your pet to be less stressed and prevent them from entering the home when they're not welcome. To set up a cat flap take a measurement of the distance from the bottom of the cat's stomach down to the floor. Draw a line along the door panel. Make sure the line is level using the spirit level. 1. The type of door It is best to consult a professional if you want to install a cat flap on an uPVC or dou