Just wanted to say that the personality and characteristics of a an animal is largely determined by the way in which it has been trained and bought up. Im always interested to find out more about the owner of the dog that attacks - rather than the breed......
Yes, this is true.
You would find that most thuggish dogs would come from a background of owners that would torture the animal, by starving them, whacking them, etc. I find it SICK how people do this to helpless animals. If they need to relieve stress, go and buy a bloddy punching bag, not a poor dog.
Although, in many cases on the news they interviewed the dogs owner and they're quite nice people amazed at why their dog did such a thing. I would say sometimes it's just a one-off thing for the dog, and I find it just as bad for authorities to put the dog down because of one bad act.