Cinnamon essential oil — far more concentrated than the spice — can cause low blood sugar and liver damage.
Even small skin contact can cause chemical burns.
Cinnamon oil contains cinnamaldehyde and eugenol in concentrations far higher than the spice. These compounds can cause hypoglycemia (low blood sugar), liver toxicity and GI irritation. The oil is also a known skin sensitizer.
Sources
Sprinkled cinnamon spice rarely causes more than a sneeze; concentrated oil ingestion or topical contact is an emergency.
Contact your veterinarian or an emergency animal poison hotline immediately. Do not induce vomiting unless instructed by a vet.
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