I've heard various versions of this story, but they're mostly associated with the Chinese (because horses weren't introduced into the Americas until relatively recently). Anyhow,
here's a version, and that's the reference for the first cartoon.
In any case, I have a lot of cartoon ideas that I'm jotting down but not completing cartoons for - hopefully I can get back in the habit of drawing again soon.
As always, there's a lot more I could say, but you know, whatever.