Puddling was a process used in ironmaking, and it involved using a heavy, wheeled machine called a "puddling furnace" to agitate molten iron and forge it into wrought iron. The process was highly labor-intensive, but it didn't involve the use of animals.
While animals were used for other tasks in the iron industry, such as hauling ore or powering machinery, puddling was a highly specialized process that relied on the strength and precision of human labor.