|Barked: Tue Dec 12, '06 11:44am PST |
|While snow, sun, chews, nutrition and bowls can cause a loss of pigment in your nose, it could also be genetic. Mom is a graduate student in animal genetics and coat color is one of her favorites.
A nose can be pigmented in 2 ways: black, brown. Seeing as you are a yellow lab, it is possible for you to have either a black nose or a brown nose, based on the colors of your parents. If either of your parents were chocolate or you had chocolate siblings in your litter, it is possible that you have a naturally brown nose. Brown is what is known as a recessive condition, where you need to inherit the brown gene from both of your parents. If you only got it fron one of your parents, then you would have a black nose, but still be "carrying" brown so you could pass it on to your offspring. If you have always had a brown-ish nose, then the fact that it is getting lighter brown with age is normal. If you started life as a black-nosed pup, then a brown nose in adulthood would be due to some of the other options stated in previous posts.
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