I would first try to determine what level of PH is good for your dog. Then I would probably start reading dog food labels of the super premium foods. If you cannot find one with a proper reading...then I would probably prepare a home made diet. There is no way I would feed Science Diet or Pro-plan to any of my dogs.
Dr. Strombeck(sp?) has a whole book of diet plans for pets that need special diets.
Moondog is our home prepared diet specialist on this forum...she will probably give you more details.
Gina