A wet nose is the mark of a happy, healthy pup, but is perfectly normal for your dog's nose to go dry from time to time. Consider your dog's nose like the human hand: dogs use it to investigate the world around them and it's always the first part of their body that initiates contact. Hydration, sunburn, wind and body temperature can all affect moistness. If the nose stays dry for an extended period of time and you see chapping start, a simple application of lubricant should help your dog.
How to Treat Dry Nose in Dogs
Gently wash your dog's nose with a soft soap. Dog stores sell safe products for this exact use, so avoid overly strong human soaps as they can irritate the nose. Pat dry.
Apply a lubricant such as petroleum jelly or a light moisturizer to your dog's nose. Be sure not to apply copious amounts as your dog will lick her nose throughout the day digesting these products can cause stomach irritation and diarrhea. Always buy moisturizer from a certified pet store as certain human products might cause an allergic reaction. Repeat this step at night when your dog is less likely to lick her nose.
Provide plenty of water to keep your dog hydrated. Dehydration will exacerbate the problem.
Keep an eye on your dog for the next few days. If you see chapping worsen, nasal discharge, diarrhea and vomiting, loss of pigmentation around the nose, or increased sunburn, take your dog to the veterinarian. These could all be signs of sickness or a skin condition.