Horrid. I feel for the family. This is why breed bans don't work- any dog with teeth (heck, any dog that's motile) can cause damage and even a chihuahua can tear apart an infant. Dogs are still animals- not hairy children, not predictable goldfish in bowls, but carnivorous, social predators loaded with intelligence, instinct, and ability. They're our pets and family members, colleagues, assistants, police officers, rescuers, therapists, hunting partners, exercise coaches, but we must never forget what they are fundamentally.
Bears repeating many times over.