Whenever we would get the post hole digger out, Dad would have me operate it but would still usually mention wanting to someday catch and train one of these animals. The North American Badger.
He thought, that owing to their speed and skill in digging holes, even in hard country roads, that they would be excellent post hole diggers if trained properly. He always said ground hogs dig diagonal holes that would be good only for fences in the hills. But Badgers dig vertically. Thus making them the obvious choice where flat ground like ours was concerned.
The question was then how do you train a badger, should you be unfortunate enough to catch one. The answer I think, is the same as to the question how do you milk a porcupine. Very Carefully.