I foster small dogs, and many are reluctant to eat when I first get them. I get a small tin of wet food (not necessarily the best brand, but one that is inexpensive, stinky and appealing to dogs - Ceasar's Grilled Chicken, or Ceasar's Beef). I feed twice a day, and I divide the tin of food into 6 equal portions with a knife. I mix 1 portion into the dry kibble completely, coating every piece of kibble. Obviously, if you have a bigger dog, you'll need to use more of the wet food to mix in. The smell of the wet food often stimulates the appetite. I store the leftover wet food in a ziplock sandwich bag in the fridge. It's worth a try.