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Friend, if she has been vomiting for 16 hours I am concern about her hydration; given that she is a diabetic it can make things worst quickly. In addition, it is important to rule out pancreatitis (inflammation of the pancreas) which can be fatal if not treated. I would strongly recommend having her checked tonight by ER veterinarian. They can start her on supportive care (IV fluids, anti emetics, etc.). In addition, monitor or blood glucose and treat accordingly. Do not give insulin tonight.
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No do Not give her Phenergan. You can start her on Pepcid AC (famotidine) 10mg 1/4 tablet every 12 hours.