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It may seem difficult to set up the flap for your cat but with the right guidelines, it's not all that difficult. Find out how high you'd like your cat flap to be (normally it's located at the belly height). Mark this point on the door and use the template provided as a reference to drill. If you have a young kitten, prop the door open a bit and gradually push it to enter. Reward it as it passes through. Measure the Door A cat flap allows your pet to go in and out of your home at the time that is convenient for you. Th