Maybe try a little tuna juice on the kibble to get his interest. Or 1/2c. of a vegetable like chopped brocolli. Even a light sprinkle of garlic powder (not salt). If he eats better that way, you can gradually cut back on the additives until he's eating just kibble.

Diabetic dogs MUST eat so they can get their insulin shots, so I've had to try a lot of things with my dog. He especially likes a drizzle of juice from a can of cat food. The vet said it couldn't hurt him.

Mary