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If your dog has had a huge change in his life (new home, new people, new life), then that is quite enough stress to cause all those white hairs.
Our collie went through the same thing when my sister (indeed my whole fam) adopted him. He started going white on his nose, eyebrows, back, and ears.
And stress can have the same impact on younger dogs. My golden is two, and he started getting white hairs on his back, eyebrows, and whiskers. I assume it has everything to do with a tough year we had last year and then his developing storm phobia this summer.
I wouldn't worry about it unless you can see other health issues (behavior, energy, eating, etc).