You might want to look at some of our products to help reduce skin symptoms and itching. 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, MSM, vitamin C, and Omega 3,6,9. Together with DERMA-IONX it produces a synergistic effect for a faster response. I would also suggest that you give your dog only filtered water for drinking and bathing if your water contains chlorine or fluoride. For the dietary modifications you might want to try a grain free diet for a while. What do you feed your dog and give for treats?
DEFENDEX shampoo which is nontoxic washes away debris and soothes the skin. I think you should also check for any evidence of fleas by using a flea comb. Sometimes you won't see the fleas but you might find small black flecks which is flea debris. Fleas really like to spend time near the tail and ears. If there are any fleas you would need to get rid of them in order for the problem to be resolved. If you find any you can let us know or talk to your veterinarian about the best way to proceed.
Please feel free to contact us again if you have any other questions.