I think that was the same person who then posted close-up photos of her horse's testicles and someone photoshopped pants on those too, LOL! The infamous Pants On Nuts. Boy she was a treat to have around!
And yup, that's an age where every time you turn around your kid goes sprinting by buck-nekked. However, you don't then park them on a horse *or* post the photos publicly online. Cute horse though.