Our dog who is not neutered, 4 years old, and half german shepherd/ half rottweiler (70 pounds) just bit my 11 year old brother for the third time. The first time was about 2 years ago. The last time was about 2 months ago and caused an emergency room visit. This time around it was borderline emergency room, and we've decided to treat his wound at home. (No bleeding this time, but a big mark and lots of pain). Is this cause to take action? He's getting neutered within the next couple weeks and has had no training or obedience school. He has never attacked anyone else and is usually the most loving cut dog ever. In all biting incidences it was over a bone or food. The boy was moving too close to Jake (the dog) and he made a one second charge in which he snapped his mouth a couple times--and growling as he quickly bit him a couple times. What should we do?