How about a medicated shampoo for the allergies? And maybe a blood test to find out what his allergies are to? UC Davis will do it, we found that Sonny is allergic to a lot of the feed we were giving him.
We've tried everything short of the allergy testing that you had done. Texas A&M is the closest place to take Tuffy that will do that type of tests.
He does get better in winter but he still scratches. In summer, without the steroid, he frantically runs from tree to tree, fencepost to fencepost, scratching. He won't even hardly stop to eat. It's been getting worse every summer for the last 3 years.