Where is he? It definitely sounds like something long-term, and could even be something as "simple" as food allergies. Have him read ingredients, and page strict attention to what is in what he's feeding her, and see what difference that makes in her stool consistency. Some dogs cannot tolerate grains, some have specific protein allergies, like King2005's pretty Digi, and where is he located? If he was up here, I'd recommend he talk to folks at Tufts Veterinary School, but if he's down there, I don't know what Universities have the best vet programs.
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