If you notice a change in your dog's attitude, energy or health, take her to the veterinarian. A simple dry nose is rarely a major problem, but pay attention to other signs that might point to more serious trouble.
Look into common problems with your particular dog's breed to give you insight about what to look for and prevention methods.
If your dog is kept outside during the day, make sure there is a shaded section in your yard for him to escape the sun.
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.
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.