I started reading Crazy Good: The True Story of Dan Patch, the Most Famous Horse in America by Charles Leerhsen. I was reviewing books in that section of the library. The book looked interesting and I realized that I knew nothing about Dan Patch, only that he was a horse that had a road on the Minnesota State Fairgrounds named for him, so I decided to check the book out and find out more.
The most amazing thing is that Dan Patch had a deformed left leg. A special cart was built for him to pull (otherwise the hoof of his bad leg would hit both the cart and his front leg when he reached even slight speed) and he wore a severely modified horseshoe on that hoof. By all accounts, Dan Patch was the happiest horse anyone had ever seen and truly loved running.