This traveling Farrier named "Lester" is working on a set of horseshoes for a very young colt that was having leg problems and the new shoes (his first) were designed to help correct the problem.
Farrier
“A Farrier is a specialist in equine hoof care, including the trimming and balancing of horses' hooves and the placing of shoes on their hooves, if necessary. A Farrier combines some blacksmith's skills (fabricating, adapting, and adjusting metal shoes) with some veterinarian's skills (knowledge of the anatomy and physiology of the lower limb) to care for horses' feet.”
Wikipedia