Is Hydrangea safe for dogs and cats?
Ask your vet about your own pet. This page is general information from the sources below.
ASPCA reports Hydrangea (Hydrangea arborescens): listed as toxic to dogs and toxic to cats. Vomiting, low mood and diarrhea. ASPCA says real cyanide poisoning from hydrangea is uncommon and it mostly upsets the stomach. Call a vet or poison line if a pet ate some. If a pet chews it, call your vet or a pet poison line.
Checked October 29, 2026.
Also called: hortensia, hills of snow. Hydrangea arborescens.
What in it is the problem
Cyanogenic glycoside.
What it can do
Vomiting, low mood and diarrhea.
Good to know
ASPCA says real cyanide poisoning from hydrangea is uncommon and it mostly upsets the stomach. Call a vet or poison line if a pet ate some.
Did your pet chew it?
Call your vet or a pet poison line, and say what plant, how much and when. If you aren't sure which plant it was, take a photo of it.
Poison emergency? Call now
ASPCA Animal Poison Control: (888) 426-4435, 24 hours a day, every day. A consultation fee may apply.
Pet Poison Helpline: (855) 764-7661, 24/7. $99 per incident, follow-up calls included.
Or call your vet or the nearest emergency vet.
For the children
"Some plants can make pets sick, and lilies are very dangerous for cats. Ask a grown-up before you bring a plant or flowers inside."
A job: Be the plant checker. Help a grown-up look up each plant in the house on this site, and write the ones to keep away on a list.
This page is general information from the sources below, not veterinary advice. Common names are shared by different plants, so check the Latin name.
Sources
- ASPCA: Hydrangea (checked October 29, 2026)