Coffee

Signs of poisoning from caffeine include hyperactivity, vomiting, diarrhea, agitation, an elevated heart rate, abnormal heart rhythms, hypertension, and even tremors or seizures.

Source: Dr. Justine Lee
http://www.petpoisonhelpline.com/

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The data represented on this page represents common agreed upon levels of toxicity by the internet community. While it may be factual, you should always check with your veterinarian in the case of a suspected ingestion.