thanks for all the great advice!! The problem must be the food then. Like I was saying, prior to the food switch, Sammy's coat was just gleaming. Now, it's quiet dull!
Jen, I never considered what may work for some cats, may not work for others. Obviously, this Felidae just isn't working for Sammy. Romeo doesn't care for it, so I can't really say his coat would be dull too, if he was eating it.
Before the switch, I was using Science Diet Nature's Best, but I heard that wasn't any good. Also Friskies, Pro Plan, Nutro, etc.
Sammy has just been very picky with his food choices .
I will head to the pet food store on Monday to buy a different brand! Also, I will try the flax oil!
Thanks, you are all so wonderful!

About the vitamin paste, I have some Nutra Cal left. I wonder if I should try that too?