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1 Artificial Sweeteners Artificial sweeteners and sugar alcohols, particularly mannitol and sorbitol, can cause diarrhea in some people. 2  Mannitol and sorbitol linger in the stomach, Schiller says, which can result in bloating and diarrhea.
One artificial sweetener in particular is very toxic to dogs-this is xylitol and any products containing xylitol should definitely be avoided. Stevia is actually pretty safe but can cause an osmotic diarrhea, so although it isn't going to cause the toxicity that xylitol would, it still isn't very ideal.