Adding probiotics and healthy oils to your dog's food can help clear up dry, itchy skin, according to The Bark. Healthy oils include fish oil and flax seed oil. You can also add the milled flax seeds directly to your dog's food.
Provide plenty of fresh, clean water, as suggested by The Bark. Feeding moist food can also help keep your dog hydrated, which is reflected in its skin. Processed commercial diets are often lacking natural oils, so feeding a balanced raw diet can also help. Other supplements, including nutritional yeast, kelp powder and spirulina, can also improve the quality of your dog's skin.
Bathing your dog can dry out its skin, according to The Bark. Only bathe your dog when necessary, and use a moisturizing shampoo and conditioner. For mildly dirty dogs, skip the shampoo completely and just use water. Avoid using a blow dryer, because heat dries the skin.
Vitamin E is also soothing and moisturizing, notes PetMD. Add it to the bathwater, or apply it directly. Let it sit for a few minutes before rinsing it off. Vitamin E can also be given as a pill, but too much is dangerous so consult your veterinarian before feeding it to your dog. Oatmeal is also soothing, so make it into a paste and apply it topically.