I can hand on heart say that I really didnt expect such a large and vehement response from my question, as I have said previously I have only recently become a dog owner, so previously I really hadnt given any thought to these dogs, I have 4 children so most of my time has been consumed by them, I only asked as this has been my experience to date. I have read intently all your comments and yes I do agree that many owners are to blame for their dogs bad behaviour, I just wondered if staffs (we dont have pit bulls in england as they are a banned breed.) were naturally vicious, as most of you have ferociously argued they are not, I'm quite happy to accept that this is true but I had to ask the question.