Whitey doesn't want to eat his most recent IAMS wet food either, that is, what we were feeding him last week before switching to prescription food.
However, he did lower himself to eat most of a different (yummier?) flavor of IAMS wet food serverd to him this morning. He skipped the IAMS dry food in the same bowl (our standard presentation), but we still have progress.
Billy, by the way, will eat anything Whitey doesn't -- this week's menu, last week's menu, next week's menu, it doesn't matter. We've taken to providing Whitey's meals in at least semi-privacy so Billy doesn't get double portions.