Why do sometimes dogs have a wet nose or a dry nose?

As a rule of thumb, a Dogs nose should be moist. If it is dry then there may be several reasons behind it. For example, it could be because of dehydration, change in weather, Allergies, or because of underlying medical problems. The solution is to regularly apply a nose balm or a wax such as the Pup wax from Puppington's. There are many Dog Breeds such as the huskies that tend to have drier noses, especially during the winter to prevent them from getting cold. one can even apply these balms on their nose as most pet huskies live inside our homes and in warmer areas.