The first dog I have has in my life is a PITBULL and let me explain somehing to everyone. Comign from some that has trained dogs for 4 years, the pitbull is a very loving and very smart dog. These dogs love their master SO MUCH that they will go to whatever means t omake them happy. Now, you take an animal like this, raise them and teach them to be mean and agressive they will go to the outer means to do that, cause thats what master wants. In this scenario with this 12 years old something happened that instigated for these dogs to do what they did, not that I agree with it because pitbulls know better when properly raised. Either the 12 yr old was being mean to the dogs when alone with them or the owners did not know about it to teach the kids not to bother them or teach the dogs not t oeven growl at the kids. Especially when they growled at others outside the house. I have a female know and she is extremely protective over my wife and my two boys. A nine year old and a 2 month old. This is my third pitbull and from what I know they are great dogs, just brought up incorrectly by owners.