Have you tried mixing it real chicken or some kind of other meat? I've never seen a dog turn down REAL chicken breast or REAL meat of any kind. I use canned food to mix with Jackson's kibble. He gets canned food mixed in real good with his kibble for breakfast and dinner but sometimes I have just regular chicken breast that I shred into his food, then I put a dab of water, stir it around so it gets on all the kibble, and he happily eats.
Also, alot of picky dogs LOVE raw food. Stella & Chewy's, Primal, and Nature's Variety come to mind. Worth looking into.