Truth versus Ashhurst

The source of the passage the essay quotes without attribution. As published:

Just as a man makes laws for his dog. When your dog does anything you want to break him of, you wait till he does it, and then beat him for it. This is the way you make laws for your dog: and this is the way the judges make law for you and me.

The essay's rendering is accurate to within a colon. The full passage is a little sharper than the quoted fragment, because it supplies the analogy's mechanism: the punishment comes first and the rule is inferred from it.