I have a fat cat (19lbs) who has all of a sudden developed dandruff. I noticed it a few days ago, mostly around his lower back near and around his tail area. I notice his coat has felt greasy the past few days. Is there cause for concern? What can I do for him? Nothing out of the ordinary has happened. I started him on a new food about 6 weeks ago (Wellness Weight control) and he's done well on it and likes it. I can't imagine that would be the cause but what do I know?