A picture would help (read the rules about size), but a typical black and tan saddle is mostly black when born with areas of tan on the feet, eyebrows, etc.. As they grow the black recedes and more of the tan shows up.
As a puppy, they have a fluffy coat and at about 3-4 months the coarser adult coat starts coming in starting at the base of the tail then down the spine. It spreads from there.
NAPWDA Certified Cadaver Dog
Waiting at the Bridge (italics
=GSDs) (hemangiosarcoma=blue):Grim , Cyra, Toby
, Rainbow, Linus, Oscar
, Arlo & Waggles