I think newgrounds needs to remember...
that not every damn thing on this site needs to be a short cartoon. Don't criticize an experimental walk cycle like you would a short. the idea of submitting a cartoon to newgrounds is to get feedback on your work. not just entertain you.
anyway aside from that I think the animation is very nice and fluid, my personal favorite aspect of this running cycle is the style and approach you took to coloring it. you really captured that velvety feel horse skin has. it's very nice.
I only voted this a 9 cause i think the head doesn't move quite as good as the rest of its body.