When it comes to granting the titles at the dog show, only then the judges would decide who bears the most beautiful coat. The coat comes the last to their attention. The winner, the current champion of the breed could be sable, and could be solid black, the colour of the coat is not principally important. The only colours would be disqualified are of a dog who is pied or piebald. Do not listen to any guys, it is very typical for the GS dogs with bi-colour coats to have their bellies and their back legs white, if not white - lighter than the tan of other parts. The main credential for GSD is and always was THE SKELETON GEOMETRY and indices of bone structure. Vertually, in order to check if your dog is a true GSD - you should look at him moving with the help of X-ray machine. Don't worry, your puppy is pure. You should worry about the development of his muscles and his intellect. GSDs were bred for their intellect as police and military dogs, prove it to yourself.