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A cat flap is a great option to give your pet the freedom to roam and avoid the hassle of letting them in and out. It will also help your pet to feel less stressed and prevent them from escaping the house when they're not wanted. To put up a cat flap to install a cat flap, measure the distance from the bottom of the cat's stomach to the floor. Mark a line along the door's frame. Make sure the line is straight using an ad hoc level. 1. The type of door It is best to consult an expert if you are planning to install a cat flap on an uPVC or double glazing glass seal