Defendex shampoo which is nontoxic washes away debris and soothes the skin. I find it is important to treat the house so that fleas won't jump on your dog. 80% of the fleas are off the dog at a time. Only 20% are on the pet. Using a product with an insect growth regulator helps get control more quickly.
You might want to look at some of our products to help heal 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 Canine probiotics, vitamin C, MSM, 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.
Please let us know how you do or if you have any other questions.