Night Wind (1948)

During World War Two,Big Dan (Flame) is a K-9 dog trained in warfare, and his American soldier mast is killed by the Germans. Years later, three men show up at a hunting lodge in America, where Big Dan is a pet of the young son of the lodge-owners. One of the men is wearing a trench coat worn by the his former master's killer. Big Dan attacks the man, who is revealed as a Nazi agent, spying on a nearby Atomic project.