https://scientific-programs.sc....ience/wiki/Cat_Flap_
If you would like to allow your pet to move around whenever they want without having to open the door, you can put in a cat flap. You should hire an expert to install the cat flap. They will navigate the complexity of putting various types of cat flaps into various doors and walls. Installation With a cat flap, your pet can enter and leave the home at any time without having to open the door. There are a variety of pet flaps to choose from, from microchip-reading and bite-proof doors to fully insulated cat flaps. They