Generally, a Cur Shepherd Mix has a higher training potential, as the German Shepherd’s bloodline adds to their existing qualities. That’s why having a Black Mouth Cur Shepherd in your home could mean better manners and greater athletic potential. On the other hand, both of these dogs need proper leadership. Owners need to show dominance to a dog, as they require a firm but loving touch. Some Black Mouth Curs or Cur Shepherds may appear stubborn and disobedient. The main difference, though, is that the first one is a purebred puppy, while the other one is a hybrid dog.