I had a neighbour who was about 98lbs soaking wet yet she had two pitbulls that were each heavier than her. She wouldn't be able to hold them back if there were ever a problem and these things were vicious, barking at everyone/everything and always chomping at each other. I always thought that it was pretty stupid that she had these dogs but she always maintained that they were for her protection.

From her I learned that often it is not the dogs that are the problem but the owner. I think certain breeds attract certain people and I always feel bad for those pitbulls or bull mastiffs that get bought for the wrong reasons. It is very sad because they can be great dogs.