It's not the dog's who are the problems, it's the owners. Any breed of dog can be trained to attack and even kill. All it takes is some harsh and abusive treatment by owners to do the job. I don't know if you hear any news about the US, but recently an Atlanta Falcons football player was arrested for running a dog fighting ring. The video I saw was gruesome: A female dog that appeared to have recently had puppies was being killed by another (possibly male) dog. Horrible, graphic detail of the kill and other kills on that video. I also found out that these despicable human beings will often drown, hang or torture dogs to death by electricution. These people don't care that the animal trusts them and DOES feel pain, fear and agony when so brutally killed. They are heartless chuman beings who simply enjoy blood, gore and killing another living creature. Thank the good Lord that this crime is now a federal offense. They need more people like the one who took the video to turn these brutes in to the authorities for punishment. Again, it's not the dogs, it's the owners. Put the abusive owners down or make them move away from their dogs.