A man once told me that his dog was half pit bull and half Poodle. He claimed that it wasn't much good as a guard dog, but it was a vicious gossip.
Stanley CorenForcing a dog into an alpha roll, or shaking the dog, both constitute physical aggression. Physical aggression is not communication. If there is good communication, then such confrontations need not occur.
Stanley CorenCompared to their sense of smell, dogs seem to pay a lot less attention to their sense of taste. Apparently they believe that if something fits into their mouths, then it is food, no matter what it tastes like.
Stanley Coren