Heh, how did you think of animating a hotdog? Personally, for the animation, I think the body should be a bit less stiff. If you think about it, when you are moving, you don't just bob your head, you move your entire body. Almost every muscle is in use when you walk. Although this is probably a bit different for a hotdog, I'm sure you could apply the same principles. As for the actually hotdog itself, I think the meat part of it just looks like shading on the bun. I don't know how you could make them seem more defined, but I think if you use a bit of the far leg tone on the meat of the dog, it should to the trick. Great work.