The only dogs I had issues with were the ones I did "random puppy playtime" with. I don't think they learned "proper" dog behavior from that experience.
I was careful with the current dog to only let him interact with stable adult dogs after he left the litter, and now he is fine, even with other dogs acting snarky around him.
NAPWDA Certified Cadaver Dog
Waiting at the Bridge (italics
=GSDs) (hemangiosarcoma=blue):Grim , Cyra, Toby
, Rainbow, Linus, Oscar
, Arlo & Waggles