I just wanted to give my 2 cents here, but I don't know if it will help any. Koby has had digestive issues since we got him almost 2 yrs ago. We've tried everything from Chicken Soup Dog Food, Eagle Pack Holistic, Solid Gold, just to name a few. We even tried crap foods 'cause we were just so frustrated and didn't know what to do! Nothing worked, chicken, beef, fish, duck didn't matter he'd always have bootie blowouts or was vomiting all the time! He got so skinny and sickly looking I was afraid to take him out in public because I was scared people would think we were starving him. We had vet checks done to make sure he didn't have any parasites or other illnesses we were at our witts end, really. I knew Koby could digest oatmeal, at the time that's the ONLY thing he could digest but I also knew he wasn't getting the nutrition he needed so I looked into oatmeal foods and found Healthwise from the makers of Innova. I also looked into California Natural, but thought I'd try the Healthwise first to see if that would help settle his tummy. Well almost instantly he had normal poops and I couldn't have been happier!! I was amazed, he was no longer vomiting all the time either. The only thing I didn't like about Healthwise was the calorie content, he needed more. I looked into Innova and California Natural again and found Innova had more calories/per cup and I thought that's what Koby needed to fill out.
I guess the point I'm trying to make is we had thought Koby was allergic to chicken AND rice and just about everything else out there because he was always sick UNTIL we tried the right food that made all the difference in the world! I'd recommend anyone try any of the foods made by Natura Pet. Innova, California Natural and Healthwise, they're all great foods and Innova has worked wonders for Koby, I think it's been about 2 months since the switch and he's gaining wait and poo's are firm! YAY!
Even if you may think Bubba's allergic to chicken, I'd say try the California Natural (they also have a Sweet Potato and Fish formula) and it give it a few weeks. If you can, pick up a smaller bag to try that way if it doesn't work you're not out a lot of money. Hang in there, I know how frustrating it is to find the right food!