https://articlescad.com/how-to....-train-your-cat-to-u
You're tired of having stand up to open the door for your pet. If you are, then a cat flap could be the answer. Pet-flap fitters can install them into any kind of door that is available, including uPVC or composite doors. They can also be installed in some types of wall. Security It is common to see cat flaps fitted into doors, however there are also a lot of people who have them fitted into windows or double-glazed doors. Having one fitted into glass can be a good option when you don't want cut through a wall