Is Hydrangea Toxic to Dogs?
Caution⚠️ Risky — depends on amount & dog
Hydrangeas are mildly toxic — they contain cyanogenic glycosides, but a dog usually gets GI upset long before a dangerous dose.
Hydrangea leaves and flowers technically contain amygdalin (the cyanide-releasing compound), which sounds terrifying but rarely plays out that way: the concentration is low and vomiting starts early, self-limiting the dose. Real-world cases are almost always a day of GI upset. Massive ingestions in small dogs are the exception worth a call.
What makes it dangerous: Cyanogenic glycosides (low concentration)
Symptoms to watch for
- Vomiting
- Diarrhea
- Lethargy
What to do right now
- Water + bland food once vomiting settles
- Call your vet if a small dog ate a large amount or symptoms exceed 24h
Sources: ASPCA Toxic Plants Database. Educational reference — not veterinary advice.