Harvey Riley, The Mule: A Treatise on the Breeding…
“ Lastly, before nailing on the shoe, and while it is cold on the anvil, strike the surface that comes next to the foot on the outside, a few blows with the hammer, right across the heels, and see also that the outside of the heels is a shade lowest, so that the animal in throwing his weight upon them will spread out, and not pinch in his feet. ”
