German Shepherd, the full name of German Shepherd Dog, is a purebred shepherd dog that originated in Germany in the late 19th century. They were originally bred to herd sheep and guard farms. Later, due to their excellent intelligence and obedience, they were widely used in military, police, search and rescue and other fields.

The black-backed dog is not actually an independent dog breed, but a German shepherd dog. A color family among sheepdogs. Its name comes from the color of the hair on its back, which is usually black, distinguishing it from other colors of German Shepherds such as Tai Chi, wolf gray and solid colors. The black-backed dog is similar in size to the German Shepherd, but its coat color is mainly black, and the color of other parts of the coat may vary depending on the individual. Their hair is usually single-layered and relatively short, which gives them a crisper look.