I will start this of by saying this is not to be used while a dog is fighting unless someone has control of the other dog ( some one to pull it away as soon as the bite is released).
I use this when
training with toys .
getting something out of my dogs mouth
Frist there is something you have to know about the dog . this is that there is a nerve inside the top lip of dogs right here
it is right at athe edge of my thumb(not on the gum)
all you have to do is roll his / her lip under and mash it against the teeth ( not to hard but hard enough ) you will have to see how much pressure to put on your dog . if you look at this pic you can see how I have his lip and that he cant bite down on my thumb.
as soon as you get whatever it is out let go .you dont want to hurt your dog just correct him/her , when you let go then talk to your dog , scold if he had something bad or prase for letting go when playing with toys .
when playing with my dog , he will bring the toy back .Ill tell him out and if he dont I'll take it useing this trick. Then ill prase him for letting go . then we start over . if you can not get the lip on the side it works on the front to being the nerve runs all the way around the mouth.