alt Hacker NewsThe thing with cats is they can do a lot of things, but that doesn't mean they will.
My cats will regularly come when called, if they feel like it.
But... what's she going to do if you say fetch? If she wants to fetch, she'll bring you the toy and if she doesn't want to fetch, you telling her that you would like to isn't going to change her mind.
After many years of living with cats, I have come to believe a cat actively refuses a command or request in a way that looks to humans like the cat does not hear or understand the request.