https://dokuwiki.stream/wiki/Fitting_a_Cat_Flap
Cat flaps allow your pet to come in and out whenever it wants. However certain cats aren't able to accept them. Some owners remove the door or prop it open to avoid this. It's easy to do with a bit of patience and a friend to assist. It is helpful to reward your cat with treats, since your cat will begin to associate the flap with positive things. Easy to install A cat flap can help to keep your cat happy and healthy. Access to the flap is unrestricted, which allows your pet to burn off energy and enjoy some exercise, which is beneficial