Rottweiler
Rottweilers are huge and really strong. If they fall in the hands of someone who is dedicated in training them, they can be really responsible and loyal. However, if they are left on their own, their true aggressive nature comes out. They usually assert dominance. They can also be destructive. The key is to have the dogs socialize as early as possible. When they are exposed to other animals and humans, they tend to be friendlier.
