Its not even hard to raise a pitbull to be a cuddle bug. They have the potential to be the sweetest dogs. But they also have one of the greatest protective instincts, and so they can also very easily be raised into guard dogs. They're smart and want nothing more than to please the person they pair bonded with.

Take a shitty owner who doesn't train the dog at all, and you get a dog that feeds off their energy and just turns in to a jogger dog.

Shame really.