If your dog has a dry nose, you can ask your dog to drink more water, eat more fruits and vegetables, and replenish water and vitamins. You can also apply some nasal ointment or coconut oil or olive oil on your dog’s nose. If you have it at home, If the environment is dry, you can use a humidifier, which can also effectively relieve your dog's dry nose. If your dog has a dry nose because he is feeling unwell, it is best to take him to the hospital for a checkup.