Medicated Dog Shampoo
A very good medicated dog shampoo for a dog with dry skin is one that contains zinc-pca. This type of zinc does a great job repairing and re balancing dog skin problems. It also nourishes the damaged skin to make sure that the zinc deficiency which most likely caused the dog skin problem has been corrected. Correcting this will end dog dry skin.
Make sure you find a medicated dog shampoo that contains zinc-pca, not another form of zinc as these types are inferior quality and have little skin healing properties. You can exptec to pay a bot more for these shampoos because of the cost of the pca type but it is well worth it.
You may also want to look for a dog shampoo that contains oatmeal. Oatmeal does a wonderful job re balancing the skins ph balance. Lastly make sure the shampoo is loaded with essential oils!