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Installing a cat flap might appear daunting, but it is fairly simple to install by following the correct instructions. Firstly, determine how high you would like the flap to be (on average or belly height). Then, mark this area on your door, and use the included template as a guide when drilling. If you have a kitten, or a young kitten you can prop the door open a bit and gradually encourage it to enter. Reward it as it passes through. Measure the Door A cat flap is a wonderful way to allow your pet to move in and out of your home as it pleases. Thi