I disagree, because I could be calling them sharply for any number of reasons including imminent danger and why make them try and interpret the subtleties of my tone?
The newspaper is visual and a whack on my own thigh adds the audio if necessary .This is as easy as it to make the dogs understand exactly what the situation is.
Here is the bottom line.
If that dog goes after me or mine it will get a lesson about messin.
If it accepts the lesson it stays.
You ever watch Dobes in Schutzhund training/exhibitions?
The agitators mercilessly ‘whack’ them with saps, whips and rubber hoses.
It doesn’t ‘discipline’ them; it just royally pisses them off.
Bad, BAD idea.