Have you tried a sprinkle of garlic powder? I have a diabetic dog and he MUST eat on schedule. When he decided not to eat, I had to try several things. Tuna water was one thing I tried. Now I mix a tablespoon of plain yogurt with his dry food, sprinkle on a little garlic powder and some green vegetable (brocolli, green beans, etc.) I haven't had a problem since starting this. And all of the other dogs love it too.

Mary