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With a cat flap you can allow your cat to leave and enter your home independently. This allows your pet to move freely and promotes exercise. It also helps prevent obesity and reduces boredom. Some taskers also deal with wall installations. They begin by marking the position of the door, and drilling around its corners. How to install a Cat Flap A cat flap allows your pet to go outside without opening windows or doors. This is a great option for those who work late or worried about your cat being left on its own