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It may seem difficult to set up a cat flap, but with the right guidelines, it's not all that difficult. Find out how high you'd like the flap to be (normally, it is at the belly height). Mark this point on the door and use the template included as a guideline to drill. If you have a kitten that is still a newborn, gently prop the door slightly open and allow it to pass through. Reward it when it goes through. Measure the Door A cat flap allows your pet to go in and out of your home at its convenience.