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A cat flap is an excellent way to give your pet freedom and save you the hassle of getting them out and in. It can also make your pet less stressed and stop them from coming into the home when they're not welcome. To place a cat flap on your door you need to measure from the bottom of their stomachs to the floor, and draw an outline on the door panel. Utilize a spirit-level to ensure that the line is straight. 1. The type of door If you are installing a cat flap into a uPVC door panel or double glazing glass