The American Tundra Wolf-dog is a North American wolf-dog breed currently in development. It also has German Shepherd heritage. American Tundra Wolf-dogs are different than Shiloh Shepherds in that American Tundra Wolf-dogs are specifically bred as a back-cross of the German Shepherd along with a random mix of wolf. It was a terrible way to breed better military dogs, as the wolf in the dogs is making them too wary and causing serious mental problems.