Spayed one and a half year old 110 pound Great Pyrenees/Akbash mix with no health problems at all. Her nose seems to be changing from that typical solid black to a shade of brown.
Her 'eye-liner', lips and pads are still black and she has pink 'thumbs'(back of fore-legs). Behaviorally, she is happy, social, playful and as vigilant as a guardian dog can be. Spends about half her day outside.
The dog nose color change started after about a week of extremely cold weather with snowfall. My dog eats a 'rotation' diet (canned puppy food, raw beef, cooked chicken, some raw high-end canned and frozen foods), is picky and prefers meat with her kibble, raw bones and assorted treats. She also buries, shoveling with her nose, some treats and bones, for later.
I have heard there is a condition (disease/deficiency) that can cause this, but no name or related symptoms/treatment.
Editor Comment Dog Nose Color Change
Two things come to mind. If your dog’s nose looks completely normal other than the lighter color (e.g., it is not losing its cobblestone appearance or developing irritated areas) a genetic condition that goes by the name “Dudley nose” is possible. This does not require any treatment, but there isn’t anything you can do to reverse the process either.
If you notice other changes to the skin on or around your dog’s nose, an immune disorder like discoid lupus erythematosis (DLE) is more likely. See your veterinarian to get a definitive diagnosis.