@Ravenbird @Rits
I should have said this in my previous post. A substantial value to the correction word, “No!” or “Hey!” is that it breaks the dog out of his current mindset. Dogs want to please, and it makes them realize they’re not pleasing.
For example, you’re teaching DOWN. You’re heeling along, you and the dog stop and he sits in HEEL. In his mind, he’d doing what you want. You’ve been telling him to sit when you stop for weeks or months, and he did it. So he’s content and happy with himself. Now you tell him to DOWN. He knows he just did what you wanted, so does nothing.
You can cajole and wheedle, “Dooowwnnn. Dowwwwn. Come on, dooownnn.” The dog hears “Good boy.” There's also the risk that the dog associated DOWN with sitting.
Or you can inform the dog that the situation is now different with a correction word that snaps him out of that mindset and makes him receptive to the new command.
I don’t even have to scream “NO!” and usually do it in a conversational tone. When I say it, I can see the dog reset himself mentally and then think about what am I telling him to do.
In the ring, the judge begins every exercise with, “Are you ready?” When I say “READY!”, it’s not to inform the judge that I’m ready because I can take it back until the judge gives me the instruction that starts the exercise. Instead, it’s to inform the dog we’re now getting serious, so pay attention.
The Positive Motivation people don’t realize the value of the correction command, in my opinion.
I remembered when I was teaching Sabrina basic herding. At that time, Sabrina had her CD and was used to working with me. The Away command means counter clockwise around the flock and Come By means clockwise around the flock. I told her AWAY and she started running around the flock. I told her COMEBY and she kept doing Away. I told her "NO, COMEBY!", she reset herself and started doing what I asked. My teacher is a Positive Motivation extremist and yelled at me for punishing the dog. There was no way I could explain to her why I said, "NO".
Update - I was thinking about READY and the dog paying attention. I just realized that when I do attention exercises, I should say READY instead of LOOK because I'm using two different words to do the same thing.