Karen,
One of my girls had severe ear and head scratching along with yeasty ears that were hard to clear up when she ate BB products (Wilderness and Basics) that contained tapioca starch. Their Freedom line use to be tapioca free, but last year they quietly changed the formula and added tapioca starch to it. Within a couple of weeks of eating the new formula, her ear problems started back with a vengeance and then cleared up, with no medication, after getting her off BB.
The BB food could be the source of your problems also. You may want to change to a brand of food that does not contain any tapioca to see if it helps.
