That animation looks like some sort of funky dance. When I imagine a cow moving, they fling their tail about a little (to get rid of flies), *are still* toss their head *stand still* and chew... not having any break in the animation makes it look as if the cor is on drugs sort of. Or just bit by a really nasty horsefly.
I like it thoguh, this is a cool idea. Technique-wise this would need tome AA. The black outlines on the cow are very sharp.