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In my dogs, chronic diarrhea has always turned out to be an infection, not a food intolerance. It's usually giardia, which can easily come back after a successful treatment, either because the dog gets infected or because the giardia stayed dormant in the intestine in medicine-resistant cyst form and then hatched out again.
So we've had a lot of success with a staggered retreatment with metronidazole. One week on, one or two weeks off, one week on.