Hmmmmm..... on one hand I did some pretty intense training with my fear aggressive boy that stopped much of his lunging. He was a lot older though -probably 2ish.
Ive seen my trainer hang a dog up for biting him over a correction that the dog deemed as unfair. Again though a 2-3 year old dog active in training that simply ignores most pressure put on him. The action didnt even phase him - may not of even gotten through to him although he did stop biting at the trainer.
For an 8 month old puppy - I would be pretty concerned. You dont correct a dog until the dog knows better, and if this pup is just beginning training - I see it not ending well.
Remember there are manu different ways to train sport/protection/working dogs. And some do it simply by dominance and fear tactics. Their dog may run a perfect obedience score at a trial. But if it's because the dog is terrified of the handler, what's the point?
Sent from Petguide.com Free App
~Emergency Vet Tech
Berlin vom Spartanville 1/13/13
2008 - 7/23/12
"Take this trouble from me: Make sure my shepherd dog remains a working dog, for I have struggled all my life long for that aim." Max Von Stephanitz