A dog's dry nose may be caused by just waking up, getting angry, hot weather, or illness. You need to observe whether the dog has other abnormal symptoms. If there is vomiting, diarrhea, poor energy, or not eating or drinking, In other cases, it may be a viral infection, and it is best to go to the hospital for a check-up. If the dog has no abnormal symptoms, you can give the dog more water and let it eat some light food.