We also have had that itchy skin so much cause of allergy reaction, we went to a
soap free shampoo after trying several oatmeal types, ones recommended by both the vet and the groomer, the one we are on now, and it
seems to be working is call earthbath I bought it at petsmart. And no conditioner cause that can be irritating

. Because of all of our allergy problems we have had to go to a summer cut too. OH, one more thing, for the itchys, I also got at the petsmart a hydrocortisone lotion, I checked w/the vet she saw it pronounced it OK, I rub this on Sprockets hind legs and rear end and across his chest. Then the fun part

, I put him in a baby onsie til the cream settles in, not a happy camper, but it seams to be working. Hope this helps and good luck hope just changing the shampoo works for you.