I don't know where you live, but, my husband is buying a holistic pet food store here in Fort Wayne, IN. If you want to call him on Monday at the store he might have some ideas for you. The number at the store is 260-483-0944, and he is open 10-7 EST. I would also suggest a simple stool test would be appropriate. If it gets too expensive, there are organizations out there that will help with vet bills. www.imom.org is a good one.

Mike (my hubby) suggested a possible ulcer too.