Very nice, although I think a more lizard-like animation would be more easily recognizable, this reminds me more of a dog run animation...If you decide to keep this, i suggest making his head move forward and down more with each step, showing more weight, and make the forward paws step further front, and cross his back legs when he takes a step with the hind legs (like racing dogs do while running).
This actually looks more like how a rabbit would move rather than a large lizard.Maybe studying the movements of a kimodo dragon would help some?