Explain Like I'm Five | Don't Panic!

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The original was posted on /r/explainlikeimfive by /u/jds6198 on 2023-06-27 18:28:48+00:00.

I just saw a post where a horse was abandoned for a number of years and it's front hooves looked like the bottom of a rocking chair. I've also heard over the years about how farriers are necessary to a horses health. Now obviously horses have been around longer than the folks who take care of their hooves, so what did they do before people?

Did they have to scrape them on rocks or did they just have to wear them down by running? Just curious. Thanks!