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With a cat flap, you can allow your cat to go in and out of your home on their own. This allows your pet to move around freely and encourages exercise. It also reduces the risk of overweight and eases boredom. Taskers can put cat flaps into wooden or uPVC doors, and some also work with wall installations. They begin by marking the location of the door, and drilling around the corners of the door. How do I install a Cat Flap A cat flap allows your pet to go outside without having to open the door or window. This is a great option if you are working late or