Probably farriers, who specialize in horse shoes.

https://en.m.wikipedia.org/wiki/Farrier

He meant furries. It's a little known fact that before the internal combustion engine, furryism was much more popular due to the greater availability of horsehair for costumes. Notable furries included Kenneth Grahame of Wind in the Willows fame and by all accounts, King Edward VII, who was sent a Russian Bear costume by his cousin the Tsar. UwU.