[theBCnut]

Try finding a food that is grain free, potato free and pretty low in carbs. My favorite kibble is Brothers Complete Allergy Formula. It is pretty pricey, but it really worked for my dog with issues like yours. It has to be ordered from their website unless you live in Ft. Lauderdale, FL

After all of the Brothers Complete formulas, I think my next choice would be Orijen or even Wysong Epigen.

High quality canned or raw are even better, but somewhat cost prohibitive in a large dog.