https://imoodle.win/wiki/Cat_F....lap_Installer_Near_M
If you want to allow your pet to come and go at their own pace, without opening the door, you can put in an animal flap. You should hire a professional to install the cat flap. They are able to handle the complexity of fitting different kinds of cat flaps to different doors and walls. Installation With a cat flap your pet can come in and leave the house at any time without having to open the door. The variety of pet flaps on the market is vast, from microchip-proof and bite-proof doors to fully enclosed cat flaps. They come with a ran