This is a picture from around 1900 of a horse getting shoed in a blacksmith shop. I suspect that probably the horse would be shoed outside, and maybe he was moved in just for the picture. Horses are pretty skittish as it is, and I would not think you would want to be hammering near them as you mess with their feet. Also, the tail appears to be very close to the forge. In any event, it is an interesting image from the past.