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A cat flap allows you to give your pet more freedom while avoiding the burden of letting them in and out. It can also help your pet be less stressed and stop them from entering the house when they are not wanted. To install a cat flap to install 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 panel. Make sure the line is level with the spirit level. 1. The kind of door It is best to consult an expert to install a cat flap on an uPV