About 7% of GSDs are black. Genetically true blacks are very black and have black noses and black pads and nails. They might have a tad of silver or grey intermingled with black between their toes and up the back of the front legs. A black GSD who carries a white recessive gene would likely show this by white toes and nails or a large white blaze on the chest or both. Some believe that some blacks with white patches are the result of some type of issue during embryonic development rather than genetics. Breeders who breed strictly for blacks, such as a breeding where five generations and all 62 ancestors are all black with no scattered tan, silver or grey hairs anywhere on them, are very black and generally blacker than most people see. My GSD is black and out of two sable colored dogs. He is very black with black nails, pads and nose and has a few silver hairs scattered between his toes and a little bit of grey going up a small section of his rear front legs. Some believe that genetically true blacks tend to be a little different in that they are often larger and tend to have a straighter back. That is the case with my dog. He is very large boned, well muscled, about 26" at the withers, has a thick long tail, and weighs about 108 pounds.