You might want to look at some of our products to help the skin. DERMA-IONX which is an oral homeopathic product stimulates the enzyme systems in the body which reduces itching and inflammation, promotes healing of the skin and helps with assimilation of nutritional components in diet and supplements. The supplements I use along with it include PROBIOTICS and OMEGA 3,6,9. Together with DERMA-IONX it produces a synergistic effect. I would also suggest that you give your dog only filtered water for drinking and bathing if your water contains chlorine or fluoride.
What do you feed your dog? Have you made any changes in food, treats, supplements, or medications recently?