Neat pix!
I had a Golden like that for 13 years, bred in Canada for hunting. Had that same "permanent puppy" look.
Lousy pet, super bird dog--just the opposite of what people apparently want in a Golden now--lots of them are just "nice furniture"! Mine was the opposite of "laid back"--full throttle all the time, and made some of the longest, hardest retrieves I ever saw, like from the top of the Snake River breaks to the riverside and back. (I'm not absolutely sure I ever actually shot that rooster, but I wasn't about to refuse it: one proud pooch!). We called him the Red Ripper.