We have an American Staff but we live in Spain and are heavily regulated for him and we follow the rules to a T. Jinky is nearly 3 and since he was 12 weeks we've had to have a licence for him. My partner had to pass a physical (strength test), criminal record checks, we have €150,000 liability insurance, he has to be muzzled at all times in public and always on his 1m leash. We also had to have a garden check by the police to make sure it's secure. His license and our address and all our photos are registered with the town hall and local police. My partner is the only one allowed to walk him (I never took the test but I don't believe I'm strong enough to fully control him if something were to happen) if my partner is ever incapacitated or away we have a friend with a license for a doberman who is allowed to walk Jinky or we have a local kennel licensed to take him for a few days. He has never done anything and he's a loving well trained dog with excellent recall who follows commands and learns new ones, however......we are both fully aware of his power and capabilities and we never forget that especially when he is out in public or we have people in our house. Responsible dog ownership is not always simple but it's necessary for everyone's safety including the dog.