One of our assignments for Traditonal Animation this semester was to make an exaggerated version of a quadruped walk cycle. We got to design the character, and could use any animal as long as it had some sort of grounding in real-world anatomy. My origional idea was to make a really heavy pig that really had to pull its wait up and forward to get around. Unfortunately the animation gods had other plans, and I had to settle for something a little less crazy, but as usual it was a learing experience.
In the end I ended up with something kinda like the guy above - he seemed like he had a pretty good sense of weight and that he was really bouncy, almost like he was walking to music. So I pushed that a little more and adjusted the character to fit...and thus was born, "Elvis"