Another tragic and preventable death.
You only have to look at the family. They are always the same type of people. In this case, an 18-year-old mother, leaving her one-year-old baby in the hands of a 7-year-old whilst a 'guard dog' Rottweiler who remains in yard 24/7 is loose. A disaster waiting to happen.
You can't blame the dog - only the idiot owners. This dog was NOT a pet. They had only owned the dog for 6 months so the dog was likely to have come from a rescue situation. I guarantee that the Rottweiler was anything but well bred. Then you must consider that the dog lived outside. The article says that the dog had interacted with children and showed no previous signs of aggression. Well, that means NOTHING. We don't know the dogs background, how much socialization is received, how much (or perhaps more accurately, how little) attention it received on a daily basis, how often it was taken out, etc.
Unfortunately, this sort of people get these breeds of dogs for all the wrong reasons. When was the last time you heard of a well bred, well looked after family Rottweiler mauling anyone? until these ignorant people learn, more lives will be lost.