This winter break I went walking several times with my mom’s dogs down at an open-space dog park outside of Denver. One of them, Chamois, loves to play fetch with the tennis ball. We use one of those long plastic launchers because that ball gets slimy! Chamois is a very enthusiastic fetch player, which often works to her disadvantage. She will give me the ball, and tear off straight away in one direction. But she almost never looks back to see where I am going to throw the ball.