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With a cat flap you can let your cat leave and enter your home on their own. This allows your pet freedom of movement and encourages exercise in order to prevent obesity and relieve boredom. Taskers can put cat flaps in wooden or uPVC doors Some also work with wall installations. They will begin by marking the position of the door and drilling around its corners. How do you install a cat flap A cat flap allows your pet to go outside without opening the door or window. This is useful when you're at work late, or if you're conce