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A cat flap is a great option to give your pet some freedom and save you the hassle of letting them in and out. It can also help your pet to be less anxious and will stop them from coming into the home when they aren't welcome. To place a cat flap inside your door, measure from the bottom of their stomachs to the floor and mark a line on the door panel. Use a spirit-level to check whether the line is straight. 1. The type of door It is best to consult a professional if you want to install a cat flap