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Hello. Thanks for the question.
For mild diarrhea in dogs, I'll often try manipulating the diet by adding more fiber. To do this, you can give 1-2 tablespoons of canned pumpkin or sweet potato baby food. If the diarrhea worsens, doesn't improve or turns bloody, then I would get him seen and start some oral antibiotics (Metronidazole).
As long as it improves, I would give it 2-3 days with the increased fiber and let this resolve. If she develops vomiting or stops eating, then again I'd get her seen and make sure she doesn't need more aggressive care.
I hope this helps, let me know if you have any other questions.