Is Buckwheat Toxic to Dogs and Cats? (2026)
Fagopyrum spp.
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Quick facts
| Toxic to dogs | Yes |
|---|---|
| Toxic to cats | Yes |
| Toxic to horses | Yes |
| Toxic component | Fagopyrin (causes photosensitization, distinct from the soluble oxalates in Rhubarb/Dock/Sorrel) |
| 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
- Tremors and kidney effects with large ingestion
Symptoms in cats
- Vomiting
- Diarrhea
- Drooling
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What to do
Keep the pet out of direct sunlight if it has eaten a large amount — fagopyrin causes a sunburn-like skin reaction in sun-exposed, lightly pigmented skin, a different mechanism from its Polygonaceae relatives.
Toxic component and mechanism
The toxic component in Buckwheat is fagopyrin (causes photosensitization, distinct from the soluble oxalates in rhubarb/dock/sorrel).
What makes this plant different
Buckwheat's fagopyrin compound causes photosensitization rather than the soluble-oxalate toxicity of its Polygonaceae relatives Rhubarb, Dock, and Sorrel — despite the family resemblance, this is a genuinely different mechanism requiring different precautions (limiting sun exposure, not just limiting ingestion).
Plant identification
- Scientific name
- Fagopyrum spp.
- Family
- Polygonaceae
- Also known as
- Buckwheat
- Typically found
- outdoor
Pet-safe alternatives
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Related plants
Dock
Rumex sp.
Rhubarb
Rheum rhabarbarium
Sorrel
Rumex scutatus
Adam-and-Eve
Arum maculatum
American Holly
Ilex opaca
Last verified: July 2, 2026 · Cross-referenced with ASPCA Animal Poison Control