Try a light sprinkle of garlic powder. Very little. Sometimes dogs need a little taste boost.

I have a dog that weighs 22 pounds. He eats 1/2 c of his food (Natural Choice) dry in the morning, but I have to BEG him to eat the 1 cup at night. I've been putting watered down canned food in his dry, but he still only eats part of it. He's thin but healthy and active so I don't worry too much.