A. As a first step recommendation I would suggest to starve her for the next 8 -12 hours and then start feeding her again with a bland diet based on chicken and rice (boiled) in small portions every 4-6 hours.
If the signs persist or she is showing other signs like diarrhea, inappetence, lethargy I would recommend to take her to your veterinarian for a check up.
Dogs rarely get poison oak, but this is not because they are immune; their fur protects them.
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