Probiotic supplements and changes in diet can soothe itchiness caused by dry skin. While allergies causing itchiness are more difficult to treat, improving your dog's diet can help prevent the development of allergies and mitigate symptoms in dogs with existing allergies, according to TheBark.com.
Feed moist food if possible, whether raw, homemade, canned or cooked. Commercial dog foods often process out good oils which provide nutrients to the hair and skin, says TheBark.com. Dry food is particularly dehydrating.
Supplement your pet's diet with fresh oils and other supplements to treat and prevent itchy skin. Flax seed oil, fish oil, lecithin granules and nutritional yeast all promote skin health. TheBark.com also recommends spirulina, kelp powder and nutritional yeast. Add a probiotic to each meal to aid digestive function. A healthy digestive system absorbs nutrients and fluids more readily from food, which improves hydration and the quality of the hair and skin.
When bathing dogs with itchy skin, avoid shampoo if possible. If shampoo is necessary to properly groom your dog, TheBark.com recommends that you use a moisturizing shampoo with humectants and follow with a moisturizing conditioner. Do not blow dry your dog. If you have your dog groomed, request that the groomer run the hair dryer on a low heat setting.