A soft mouth can be the difference between life and death for dogs.
All dogs come equipped with powerful jaws and teeth capable of inflicting injury, but they vary in their willingness to use them as weapons. Most save them for marrow bones, chews or Kongs, a quality that makes for good pets and great friends. The degree to which dogs learn not to use the full force of their mouths on people and other dogs is called “bite inhibition,” and it is the most important part of a dog’s education.
via Whisker Therapy