Unfortunately this is probably his core temperament. A confident adult is usually a bold and confident puppy, as you can see with your female. There is a lot of good advice her for raising a pup who is a bit skittish.
NAPWDA Certified Cadaver Dog
Waiting at the Bridge (italics
=GSDs) (hemangiosarcoma=blue):Grim , Cyra, Toby
, Rainbow, Linus, Oscar
, Arlo & Waggles