I'm sure the owners of these dogs never imagined they would be on the 6 o'clock news one day when they first brought their cute little puppy home. If they had taken some simple steps when they first got their new puppy, they may have easily avoided a terrible situation later. Every dog is capable of biting. Biting is a natural behavior for dogs to engage in. It is a way for a non-verbal animal to communicate certain things very clearly.
Dogs have an extreme and very precise level of control over their bite.
A dog can easily move his head four times faster than a human can move their hand. He only wanted to warn. The same is true if a dog makes contact with human skin. He only does that if he means to. He decides how much pressure to apply and for how long.