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It can be difficult to put up the flap for your cat, but with the right guidelines, it's not all that difficult. First, determine the height you would like the flap to be (on average, belly height). Note this on your door, and use the template provided to guide you when drilling. If you have a kitten who is still a baby then gently prop the door slightly open and allow it to walk through. Reward the kitten every time it goes through. Take a measurement of the door A cat flap lets your pet to go in and out of your home at its convenience. This can he