Can you tell me my dog's breed, age, and physical characteristics?

Max looks to be a German Shepherd but if there is a small amount of a different breed (like a single great grandparent), if may be difficult to detect by looks alone with so much German Shepherd genetics present. He does not have the straight back of most working lines, nor is he quite as angulated as most show lines. His breeder would be the best source of information as to the different bloodlines present and if there was a mixing of show lines and working lines. He has the more rare long coat for the breed. From the photos he appears to be black and tan with the normal saddle markings. I hope this is helpful and please feel free to post any additional questions.