https://scientific-programs.sc....ience/wiki/Cat_Flap_
If you wish to let your pet to go and come as they please without opening the door, you can put in an animal flap. However, you should always employ a licensed professional to do so. They are able to handle the complexity of fitting different kinds of cat flaps onto different walls and doors. Installation With a cat flap your pet is able to enter and leave the home at any time without having to open the door. There are many different types of pet flaps that are available including microchip-reading and bite-proof doors t