Any breed of dog is capable of nipping/biting/mauling or killing a child. It is important to understand that certain breeds have different bite styles and as a result can cause more damage if they do bite especially when a young child is involved. You have to know your dogs breed characteristics to help you know what their bite style is. A herding dog such as an Australian Shepherd was bred to herd. Therefore their bite style is to nip and they can tend to bite at kids legs when they run. A Pit Bull has a fight drive and their style of biting is to hold on and thrash. Jack Russell’s were bred to hunt vermin and they also will tend to hold on to their prey. Any bite can cause damage and also a dog that normal would bite and pull or maybe nip could also be capable of other styles depending on the response they are getting while on the bite.