My Bridge girl Gypsy was on Sulfasalzine. She did very well on it. We also fed her Taste of the Wild Pacific Stream. She could not have lamb, bison, vinsion or poultry. She did best on fish and no grains. She also needed a bedtime snack or she would get sick around 3 or 4 in the morning.
Hope you find what works for your pup. Took us a few months to come up with what worked best for Gypsy.