As heavy horses have made several appearances in this thread, I thought that this picture might be of passing interest.
The shoe on the left is from a Shire and that on the right is from my old horse.
He was a fairly big lad and wasn't exactly small in the hoof department, but his shoe pales into insignificance next to the Shire's.
Incidentally, I've never met a farrier who didn't wear steel toe capped boots.