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A cat flap is a great way to give your pet some freedom and save you the hassle of having them go in and out. It can also make your pet less anxious and will stop them from coming into the home when they're not welcomed. To install a cat flap, measure the distance from the bottom of the cat's stomach to the floor. Draw a line along the door's panel. Check that the line is straight using the spirit level. 1. The type of door If you are fitting an animal flap onto an uPVC door panel or a double glazing glass sealed unit, it is often