Good start. A few crits though for refinement if you allow. First the back feet are a bit robotic compared to the front ones. Smoothing out the touch-down and lift-off should help there. The second point is the phase. Two feet touch down at the same time. For a fluid motion the touch down of the 4 feet in a cycle should be all unique. Just offset the timing of the back legs by a couple of frames (~10 on a 50fps sequence) and the motion becomes more fluid. The last point is though subjective I guess and that's the size of the head. In my opinion it is too small compared to the body. I would say 50% more size feels right to me.
its made with blender ^^