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Fitting a cat flap can be a bit daunting, but it is fairly easy to do by following the correct instructions. First, determine the height you want the flap to be (on average, belly height). Then, mark this area on your door and then use the template provided as a guide when drilling. If you have a kitten that is still a baby and you want to keep the door open, gently prop it slightly open and allow it to go through. Reward it as it passes through. Measure the Door A cat flap is a great option to allow your pet to come and go into and out of your home