I was wondering the same thing, my border collie Gibson, just had his check up last week, and the vet said he was healty, a bit well fed, but otherwise he is doing well, when at the vet I asked him about Gibsons dry chapped nose, he is sneezing, and looks like a small boy with a snotty nose. The vet told me it was nothing and if I was worried about his nose then I should just soak a hand towel in epsom salt and hold it on his nose. Eventually it would go away. I was a bit worried about that, as I figured the salts would dry out his nose more, so I have been putting polysporim on it. For the past few days it seems to be helping. I hope this helps, but when it comes to the health of your loved one, please call a vet.