Is Hellebore Toxic to Dogs and Cats? (2026)
Helleborus niger
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Quick facts
| Toxic to dogs | Yes |
|---|---|
| Toxic to cats | Yes |
| Toxic to horses | Yes |
| Toxic component | Cardiac glycosides (bufadienolides) and protoanemonin |
| Onset of symptoms | Within a few hours |
| Indoor / outdoor | outdoor |
If your pet ate this plant
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Symptoms in dogs
- Drooling
- Severe vomiting
- Diarrhea
- Abnormal heart rhythm
- Seizures with large ingestion
Symptoms in cats
- Drooling
- Severe vomiting
- Diarrhea
- Abnormal heart rhythm
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What to do
Treat as a serious exposure — despite being a popular cold-hardy winter-blooming garden plant, Hellebore combines a cardiac glycoside risk with the oral irritation of protoanemonin.
Toxic component and mechanism
The toxic component in Hellebore is cardiac glycosides (bufadienolides) and protoanemonin.
What makes this plant different
Hellebore and Christmas Rose refer to the same Helleborus niger plant — its winter-blooming habit makes it a distinctive garden feature, but its cardiac glycoside content places it well above most 'ordinary' garden perennials in real severity.
Plant identification
- Scientific name
- Helleborus niger
- Family
- Ranunculaceae
- Also known as
- Hellebore, Christmas Rose, Lenten Rose, Easter Rose
- Typically found
- outdoor
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Last verified: July 2, 2026 · Cross-referenced with ASPCA Animal Poison Control