Do doodle noses change color?

[Cam & Oski]

I'm curious. I've seen some doodles who have pink noses with black around the edges. I've also seen pure labrador & golden retrievers with noses that started out black & turned pink/rose. So, do doodle noses change color over time too? What do you guys think?

[Karen, Jasper and Jackdoodle]

And here's another, this one mentions Labs & Goldens:

depigmentation
removal of pigment; usually refers to melanin. See also hypopigmentation.
--------------------------------------------------------------------------------
nasal depigmentation
occurs in dogs with a normal, darkly pigmented nasal planum at birth which later fades to brown or a pale gray-white. Called also Dudley nose, the cause is unknown, but it may be a form of vitiligo. A seasonal loss of pigmentation, usually during winter months, occurs in some breeds, including Siberian huskies, Golden retrievers, Labrador retrievers and Bernese mountain dogs. Called also snow nose.
Depigmentation (Dudley Nose).

[Jaime]

Penny's nose changed from black to a pinkish color. She uses metal bowls for food and water. I asked the vet last year at her checkup and she said that some dog's noses just change color. Her lips are still black!

[Lucy's Mom~ Liz]

Lucy has been turning from jet black to a lighter brown... wondering what this is, so I'm glad to see I'm not the first to ask!
She spends a lot of time digging in the snow- so I love the name "Snow Nose"! I thought maybe it was because she's "maturing" into a 2 year old. Interesting comment about vitamin E. What about D if not enough sunlight?