i usually wet the dry food down with water. not a lot, just enough to make the food wet with a little on the bottom. My dog is young (8 months) but he loves it ... be careful with portion sizes though because he wolfs it down (i'm sure that won't happen with your dog since its been having problems, but you never know) and i would try to mix old food with new food.
let us know how it goes...
i'm sorry he's not eating though
