Since skin is an elimination organ, I almost always believe that the skin shows what is happening on the inside of the body. In other words, if the skin is irritated - we need to fix something from the inside out. That isn't to say that topical products (like sprays) can't irritate the skin, they can. But I think ongoing skin problems have more to do with chronic internal issues (that can then
also cause/exacerbate external issues) that have to be uncovered and addressed. I think you're on the right track with looking at the diet. You could also try Eicosaderm from
www.vetamerica.com - it is fish oil + vitamin E and will help w/ skin/coat - provides EFAs.