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allows you to allow your pet to roam more freely without the hassle of having to let them in and out. It can also help your pet to be less stressed and prevent them from coming into the home when they're not allowed to do so. To put up a cat flap, measure the distance from the bottom of the cat's stomach down to the floor. Mark a line along the door's frame. Use a spirit-level to check whether the line is straight. 1. The kind of door It is recommended to speak with an expert if you are planning to install a cat flap on the