Is Rhododendron Toxic to Dogs and Cats? (2026)
Rhododendron spp
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Quick facts
| Toxic to dogs | Yes |
|---|---|
| Toxic to cats | Yes |
| Toxic to horses | Yes |
| Toxic component | Grayanotoxins |
| 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
- Drooling
- Vomiting
- Weakness
- Abnormal heart rate
- Collapse
Symptoms in cats
- Drooling
- Vomiting
- Weakness
- Abnormal heart rhythm
Symptoms in horses
- Colic
- Weakness
- Abnormal heart rhythm
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What to do
Treat as an emergency — grayanotoxins affect heart rhythm and can progress quickly even if the pet seems fine initially.
Toxic component and mechanism
The toxic component in Rhododendron is grayanotoxins.
What makes this plant different
As few as two leaves can produce serious toxicity in a small dog, since grayanotoxins act directly on sodium channels in heart and nerve tissue rather than causing simple GI upset — a fundamentally more dangerous mechanism than most 'mild' ornamental plants. Azalea and rhododendron are also common hedge plants, making unsupervised backyard exposure more likely than for typical houseplants.
Plant identification
- Scientific name
- Rhododendron spp
- Family
- Ericaceae
- Also known as
- Rhododendron, Rosebay, Azalea
- Typically found
- outdoor
Pet-safe alternatives
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Related plants
Andromeda Japonica
Pieris japonica
Azalea
Rhododendron spp
Black Laurel
Leucothoe spp.
Bog Laurel
Kalmia poliifolia
Dog Hobble
Leucothoe sp.
Last verified: July 2, 2026 · Cross-referenced with ASPCA Animal Poison Control