I have a cat that can fetch, but I did not teach her, she just started doing it. I had brought some labels to stick on envelopes for work and I was sitting in the floor putting them on and Soltie would not leave me alone, so I took some of the sticky stuff from the labels and made a ball and threw it, thinking that she would starting batting it around and leaving me alone, well lo and behold she brought it back to me, didn't think much of it the first time, but threw the ball again and she brought it back to me, and from that day on she will bring you those little furry mice for you throw and she will bring them back. You can take one of the mice and let her watch you put in and out of a shoe then throw the mouse and she will bring in back and put in the shoe. She is very good at figuring things out for herself. Which can be a good thing and also bad thing when trying to keep her out of stuff, because if she REALLY wants it, she will find a way to get it.