I've been working with Marcus on learning how to Fetch - or rather, learning how to bring the ball back once I've thrown it, because he seems to prefer just tossing it up and playing with it by himself. I got a short video of him playing Fetch this afternoon - he normally runs after it a lot faster, but the Hamsters were awake and he really, really wanted to look at them instead. Still, here a video of his cute little ears flopping about as he runs back with the ball.
Marcus didn't really have that much interest in the Hamsters until a few days ago, when I put the cage down at a level that he could easily see. Now whenever the Hamsters are awake, it's the Corgi equivalent of Must See TV - he just sits there in front of the cage, completely engrossed in them.