We are introducing challenges but I'm not sure how to do it properly. We tried grapes last week and all seemed fine, then we tried a small handful of raisins this week and he's gone loopy again. Now I don't know what to try next and have lost confidence because I'd rather he didn't go off the failsafe, because he's so obnoxious, but I know he wants to widen his diet ... update one week later ... The RPAH salicylate challenge showed he reacts to salicylates! - we were sailing along at first but then hit a wall where his behaviour went downhill rapidly. – Denise by email