The stable orderlies shoveled the sh!t. Not that it's that bad a job. Horses eat only grass, hay, and grain - so it isn't like you're shoveling the output of a carnivore. I've probably shoveled 30-40 metric tons of the stuff over the last 45 years or so.
Just the price you pay for getting to play with horses.
LOL
I got tired of shoveling it and joined the AF