Definately not fleas, already tried that. We have tried Nutro, somethng else i cna't remember and now Purina One. I'm crossing my toes and hoping its mites. Or, i'm also hoping that maybe this new thing on her back reveals the answer :-( My poor girl...

We have two seemingly healthy cocker spaniels, a 3 year old and a 1 year old. The 1 year old has always been really sensitive when you scratch her. If you scratch...