An aggressive dog, trying to attack other people and other dogs is no joke. Aggressive dog training can be dangerous and you have to make sure you deal with it properly and safely. Here is a young beautiful south African Mastiff better knows as a Boerboel. He does go after people and dogs BUT you have to find out the why? In Cooper's case, he just doesn't know what else to do, he's strong and powerful and his owners desperately need help. | Tom Davis Dog Training