A wet nose for a canine is a must-have for it to function properly. It is not a sign of any flu-like ailment but a natural way to work better. The moist outside of the nostrils and the mucus-covered inside of the nostrils trap scent particles. Dogs dislike having dry noses. They tend to lick their noses to provide moisture to their nasal cavity. An intelligent dog doesn't want to be left behind with important information because of a dry nose!