Horse shoes and horse boots are human inventions. Odds are that we'd use something similar for ourselves, if our feet were similar to the horses'. If our legs still have that weird "almost haired, but not so much" pattern we'd likely make the "human horse boots" a bit longer and more flexible, like socks or stockings, to wear in cold days.

It's also possible that we'd wear something around the hoof and horseshoe. Mostly to keep the hoof clean - like that sort of boot that you use over your shoes.

Nail polish would probably be the same.