https://scientific-programs.sc....ience/wiki/Get_a_UPV
Install an animal flap if you want your pet to leave and come back anytime they want without opening the front door. It is recommended to hire a professional to install the cat flap. They will help you navigate the complicated process of putting various types of cat flaps to various walls and doors. Installation With a cat flap your pet is able to enter and out of the house at will without you having to open the door. There are a variety of pet flaps to choose from including microchip-reading and bite-p