§ Toxic plants · Hydrangeaceae · Checked Oct 2026
Is hydrangeas toxic to cats and dogs?
Yes. Hydrangeas (Hydrangea spp.) is toxic to cats and dogs, according to the ASPCA Animal Poison Control Center. Plant Smart rates its effects Moderate, level 2 of 4.
Get a permanent discount if you join Early Access. iPhone and Android, in the contiguous U.S.
§ 010 · Signs
What to watch for
Signs include vomiting, dullness or depression, diarrhea and belly pain. Signs can start within hours; some take a day or more to show.
§ 020 · If it happened
What to do if your pet ate it
Call your vet or a pet poison hotline straight away, even if your pet seems fine: the ASPCA Animal Poison Control Center, (888) 426-4435, or Pet Poison Helpline, (855) 764-7661. Both are open 24 hours and charge a fee. Have the plant or a photo of it to hand, and don’t make your pet vomit unless a vet tells you to.
§ 030 · Same family
Other Hydrangeaceae plants toxic to pets
Hydrangeas belongs to the Hydrangeaceae family. ASPCA lists these relatives too.
§ 040 · Questions
Questions about hydrangeas and pets
Is hydrangeas toxic to cats?
Yes. ASPCA lists hydrangeas as toxic to cats.
Is hydrangeas toxic to dogs?
Yes. ASPCA lists hydrangeas as toxic to dogs.
What happens if my pet eats hydrangeas?
Signs include vomiting, dullness or depression, diarrhea and belly pain. Plant Smart rates it Moderate, level 2 of 4.
What should I do if my pet ate it?
Call your vet or a pet poison hotline right away, even before signs appear: the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661. Both charge a fee. Have the plant, or a photo of it, to hand.