Tea

When tea leaves or anything containing tea products (e.g., green tea supplements, etc.) are ingested by pets, signs of caffeine poisoning can be seen, and 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/

Some teas may also be made from plants that are toxic to your pet.

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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.