Do you have any idea how well they socialized him at the shelter? My pups start meeting new people at 5 weeks.What a grand assumption from somebody who doesn't know anything about me or my dog. He was socialized. he went everywhere with me. everything from a young age was fun, meet a new person? treats and play, oh so fun. I closely followed Ian Dunbar's approach to training.
His genetic predisposition to anxiousness is like a collies genetic predisposition to herd. Unstoppable... Manageable.. but unstoppable
It is definitely also genetic.
... maybe not for a pet owner, but dock diving with a PWD sounds like fun.. I couldn't see the first photo of your dog, but I saw the second. Very cute!