My Digi doesn't have the same issues, but she does have an Extremely Sensitive Digestive System. Her triggers are anything from Mammals & Shellfish..

I spend about $30/month to make her food. I use whole Hens (chicken), & whole Fish (100% uncleaned.. meaning it has all its guts, scales, head, fins, etc.)...

I pressure cook it into mush, blend it into paste, add blended cooked veggies, divide the meat & veggies accordingly & then use all the left over liquid to help form gelatin so it stays together so its easier for Digi to eat.

Before I left on a 3hr trip I added warm water to some food to make a soup so Digi would have a lot of water in her system as it was HOT outside last weekend. She pee'd a lot but felt fine as she wasn't dehydrated.

So if you dog is having food issues, try fish & chicken kibbles. But the good kibbles not that LOW quality Iams & Pedagree stuff... <-its not food in my opinion, its stuff.