Is Holly Toxic to Dogs and Cats? (2026)
Ilex opaca
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Quick facts
| Toxic to dogs | Yes |
|---|---|
| Toxic to cats | Yes |
| Toxic to horses | Yes |
| Toxic component | Saponins and methylxanthines |
| Onset of symptoms | Within a few hours |
| Indoor / outdoor | outdoor |
If your pet ate this plant
Both lines are staffed 24/7. A consultation fee applies to each. Do not wait for symptoms to appear before calling.
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Symptoms in dogs
- Vomiting
- Diarrhea
- Drooling
- Lip smacking
- Head shaking
Symptoms in cats
- Vomiting
- Diarrhea
- Drooling
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What to do
The spiny leaves often cause more mechanical mouth irritation than the mild toxin itself; berries are the more commonly ingested part. Usually resolves with monitoring.
Toxic component and mechanism
The toxic component in Holly is saponins and methylxanthines.
What makes this plant different
Holly berries are a well-known winter-decoration hazard, but ASPCA data classifies the toxicity as mild — the bigger practical concern for small dogs is often the physical size of swallowed whole berries rather than the saponin content.
Plant identification
- Scientific name
- Ilex opaca
- Family
- Aquifoliaceae
- Also known as
- Holly, English Holly, European Holly, Oregon Holly, Inkberry, Winterberry
- Typically found
- outdoor
Pet-safe alternatives
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Last verified: July 2, 2026 · Cross-referenced with ASPCA Animal Poison Control