https://scientific-programs.sc....ience/wiki/Cat_Flap_
Getting a cat flap fitted inside your home can be a major step for any pet owner. Whether your cat is old and requires extra security, or you have kittens who require a vet check there are plenty of options out there to choose from. It can be intimidating for people who aren't experts in installing an animal flap, but with proper instructions, it's simple. The key is preparation, planning and accuracy. Select the Right Door or Windows There are a myriad of kinds of cat flaps, including some with locks that can be used