there have been several newfoundlands who have rescued people throughout history. napoleon was reportedly saved by a fisherman's newfie.
another was :
In 1828, the Harvey family, a respected family well known in the history of Newfoundland, with the aid of their Newfoundland dog, "Hairyman", rescued 163 people from the "Despatch", shipwrecked on the rocks off Isle aux Morts. from this site: Dogs In History
newfoundlands have saved people with little to no training at all..