A couple of days ago, I blogged about my struggles with teaching Bosley about Dumbbell work. A couple of the comments on my comment page were asking how would an ear pinch work to teach a retrieve.
I have not used this method, but I know that it is a very popular way for hunting enthusiasts and competitive obedience people to train a retrieve. I cannot personally comment either way about the positives or negatives about using an "ear pinch" except to say that it is not the way that I choose to train. I try to use mostly positive reinforcement in my training where as the "forced retrieve" uses negative reinforcement (something removed increases behavior). The ear is pinched and when the dog holds the dumbbell the pinch is removed and as the operant conditioning theory suggests, the dog will be more likely to increase the frequency in which he holds the dumbbell in order to avoid the negative reinforcer (ear pinch).
Here is a link to an article that explains this method better: Ear Pinch