My little 3 month old is starting to get dry skin like we all are around here in Michigan. Thats what winter air does. Anyways her belly and under her arms are a little pink and chapped, but it does not seem to bother her. My question is her skin(not fur, which is fawn) now seems to be turning a darker color in those areas. Almost a greyish color. Can their skin color change, should I be concerned, what can I put on it? She has a regular vet check up next week, so I will ask there, just wanted some input. By the way she is being fed Blue Buffalo puppy food. Should I add more flax or fish oil? Thanks