This behavior can take on many forms such as becoming still and rigid, growling, snarling, baring teeth, lunging, and nipping or at worst biting. This behavior roots from unaddressed reactivity or a learned behavior in a sense survive.
Here at Mannered Mutts we take a special pride in not giving up on any dog. We believe in offering all dogs a second chance. We teach them how to work through their fears and behaviors in a healthy manner.