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Toxic: keep away from dogs
Can Dogs Have Hydrangea? DogSafe severity score 5/10 A top-five reported toxic-plant exposure in 2025.
Call a vet or poison control now. Do not wait for symptoms.
ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661 . A consultation fee may apply.
Part of our guide to Is Hydrangea Safe for Dogs? Identification, Symptoms & Next Steps .
Check Hydrangea for your dog
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Amount eaten A nibble A few leaves A large amount / whole plant Not sure
Check Hydrangea Why Hydrangea is dangerous A top-five reported toxic-plant exposure in 2025. Leaves and flowers contain cyanide-type compounds.
Signs to watch for Vomiting, diarrhea, lethargy, low energy
Related items Check the exact item or ingredient before assuming two similar exposures carry the same risk.
A closer look at hydrangea A top-five reported toxic-plant exposure in 2025. Leaves and flowers contain cyanide-type compounds. The details below use the specific facts for this exposure, rather than treating it like every other plant question.
1. Start with the exact exposure For a closely related comparison, read Hyacinth Bean . Large amounts are needed for serious effects, but GI upset is common.
2. Use the facts to decide whether to monitor or call Another helpful reference is Indian Rubber Plant . A small nibble: watch for vomiting/diarrhea. Large amounts, or ongoing vomiting and lethargy.
FAQ How much Hydrangea is dangerous?
Large amounts are needed for serious effects, but GI upset is common.
Can I treat this at home?
A small nibble: watch for vomiting/diarrhea.
When should I call the vet?
Large amounts, or ongoing vomiting and lethargy.
Compiled from veterinary poison-control and medical reference sources, including the ASPCA Animal Poison Control Center, the Pet Poison Helpline, and the Merck Veterinary Manual. This is general educational information, not a diagnosis or a substitute for examination by your veterinarian. DogSafe's severity ratings are our own assessment, calculated from published guidance and your dog's weight. In an emergency, call ASPCA Animal Poison Control at 888-426-4435 or the Pet Poison Helpline at 855-764-7661.
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