What really helped Tubby - after 17 years of dandruff - was brushing him regularly with the shedding blade that was discussed here. Any other brush really brings up the dandruff, but the shedding blade not only doesn't bring it up, but it seems to eliminate it all together. Tubby's coat has seriously never looked better than it does now. I don't know how often you brush Rocky, but this might help until you find another solution.