https://output.jsbin.com/pecacaboza/
Installing a cat flap might be a bit daunting, but it is fairly easy to do with the proper instructions. First, decide how high you want the flap to be (on average the belly height). Then, mark this area on the door, and use the template provided as a reference to drill. If you have a kitten who is still a baby and you want to keep the door open, gently prop it slightly open and invite it to go through. Reward it each time it goes through. Measure the Door A cat flap allows your pet to enter and exit your home at the time that is convenient for you.