In the dog rescue circles it's known as DIMITTO ( dog is more intelligent than the owner). Over the years I have handled many dogs, most have been abused badly by their old owners, and a few have been aggressively defensive. Despite being forced to have three dogs destroyed, because we couldn't re-train them, I have only been bitten once, and even he didn't have the guts to break the skin of the alpha male (me). As has been said before it's the thrill of the chase that dogs really love, they want to run, that clip of Fenton shows a dog not hunting deer but chasing them (deer are especially bad as those little white tuffs of tail are like targets. becoming physical with a dog you don't know should be left as a last result.
The best command to use is no, shouted nice and loud (a few swear words will normally give your voice the right tone as well).