I do this a little differently than Ed does. I like to have the dog on leash for the safety of the decoy and because this involves a lot of moving around.
I like to start out by teaching the dog to set his bite in a certain spot for the safety of the decoy during this work. If the decoy extends his arms straight out to the side, The line extends from one elbow across his chest, to the other elbow. In this area the decoy can grasp the dog's collar (I like to have him wear a 1" leather collar for this) so that if the dog goes to transfer his bite or comes off the bite the decoy can straight arm the dog and protect himself. I've found that if you bite just one decoy on the face, the rest tend to be too busy to work with you again.
Like most things I do it starts out gently and then escalates slowly. I up the ante a little at a time, carefully watching the dog and making sure that he's comfortable with each stage before advancing to the next. The best indicator of this is his tail. It should be gently wagging back and forth, held in a neutral position. If it goes too high or the wagging stops, I back up the training and let him win.
The first stage is simply enveloping the dog's head with the decoy's arms. This is one reason that the bite is placed as I've described. After the dog is comfortable with this, he grasps the dog's leather collar next time. Then he envelopes the head and steps across the leash so that the dog is between his legs and he's straddling the dog. He can't see the dog's tail at this point so the handler will have to tell him how the dog is feeling. This is the case at other points of this training as well, when the decoy can't see the dog's tail.
If the dog is OK with this then the decoy steps off him and goes to the next step which his going to the ground. This is done gently with the decoy (keeping the dog's head enveloped) squatting down as much as he can and then rolling backwards onto the ground. He should end up with the dog on top of him.
The next progression is to have the decoy wrap his legs around the dog. If the dog tolerates this well he should take the dog off his feet so the two of them are lying on their sides. The next step is for the decoy to get on top of the dog but with his weight supported on his elbows and knees. Then he slowly put his weight on the dog.
If, at any time the dog releases the bite, the decoy straight arms him and the handler takes him away. If the dog shows some concern at any stage of the training, back up. Work at that level for a few more sessions allowing him to become comfortable before moving up to the next stage. The idea is to let the dog win at each stage.
With some dogs it will take weeks to get to the final stage, some will never make it and some can do it on the first bite of the first day.
Lou Castle has been kicked off this board. He is an OLD SCHOOL DOG TRAINER with little to offer.