I have a Trained Working Dog. I know her blood line, what the temperment was bred for, and bought exactly what I wanted. People that dont "know" dogs, and have enough sense to buy a good line dog, dont need to own them. I bought my Shepard for one thing, to be trained to attack, high strung, short temper, and as nervous as a whore in church. $2500, got exactly what I was looking for. I can promise you, she will bite an ass 1000 times faster than any of my Pits would. Even better, she's my house dog. We know where her line is as with any other dog, you have to "know" them, EVERY DOG IS DIFFERENT. Dogs have attitudes just like humans and differ, from day to day. Ive had large breed dogs since I was born, and every dog wether it's small or big, can and will bite. The only difference is when, and the amount of damage they do.