One of our dogs is a Cairn Terrier that just decides to pass on eating, sometimes skipping a day. She has done it for years. Every time it happens, the DW is convinced the goofy brown fur ball is dying. I then perform the "stinky fish" test. I crack open a tin of smoke herring fillets, and dribble the fish oil all over the dry dog food. As I'm finishing that task, the dog is sitting next to my heel, and shaking in anticipation. Since I saturate the 1/2 cup portion of small kibble, the little bugger has no choice but to eat every bit, to get to the bottom, and lick up every last molecule of fish oil.