One of the first signs of vitamin deficiency in your dog is through are dog skin and hair conditions. If your dog is deficient in Vitamin B5, biotin, and Vitamin A, the skin and hair can be less than lackluster and even graying and hair loss can result. Get diet and vitamin supplement tips on how to keep your dog's coat as shiny and healthy as can be. Read about what external factors can affect your dog's skin, the types of conditions, symptoms to look out for and treatment. Prevention is key and the more you are familiar with what causes these conditions, the better you will be in preventing future issues.