Hannah, a 10-year-old, spayed Labrador retriever mix, presented for vomiting of 5 days’ duration, accompanied by occasional bouts of diarrhea and a decreased appetite. She was otherwise reported to be healthy and current on vaccinations, and was receiving levothyroxine tablets at 0.8 mg PO q12h for hypothyroidism. Approximately 7 weeks before the onset of clinical signs, Hannah had eaten cupcakes from the kitchen counter.