All 4 of mine like a little chopped brocolli (or green beans, carrots or squash)on top of their food. I also mix in a tablespoon of plain, fat free yogurt. They weren't interested in plain kibble but really like the veggies.

Also, try a tablespoon of water from a can of tuna. You can add a 1/2 cup of water to a can and drain it off to keep in the fridge for future meals.

Mary