I think that is perfectly normal. My Beau had a crazy expressive tail like that and then he carries it high when he "Struts" around other dogs. It is not as crazy as when he was a puppy but it is still pretty expressive.
NAPWDA Certified Cadaver Dog
Waiting at the Bridge (italics
=GSDs) (hemangiosarcoma=blue):Grim , Cyra, Toby
, Rainbow, Linus, Oscar
, Arlo & Waggles