I don't like this one but it Might Be Necessary
Tip No.9 Physical Correction
Physical correction should be used sparingly with any dog, and not at all with
dogs that have aggressive tendencies. Before you use any of these techniques
make sure that you have tried everything else – twice! It is also a good idea to
muzzle your dog before trying these methods.
With the first method, try grabbing hold of the
scruff of your dog’s neck and lifting his front
feet off the ground. Look him in the eye,
gently shake him and give the command "No".
This will enforce your position as the dominant
dog because in the wild a dominant dog would
often grab a subordinate dog by the scruff of
the neck to show his dominance over the
lower dog.
The second method is to roll your dog onto his back by gently pulling his legs out
from underneath him. If you use either of these methods then be careful not to
cause injury to either your dog or yourself.