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Is Blue Cohosh Toxic to Dogs?

☠️ ToxicSeverity: Moderate
✅ Cross-checked against veterinary poison-control guidance · Oct 2026 audit
⚠️ Educational info only. If your pet just chewed something and looks unwell, skip the reading and call your vet or Pet Poison Helpline (US): (855) 764-7661.
Yes, blue cohosh is toxic to dogs. The plant’s saponins upset the stomach, and its cytisine-like alkaloid can affect the heart rate.

Also known as: Caulophyllum thalictroides, Blueberry Root, Papoose Root · Caulophyllum thalictroides

What makes it toxic

Caulosaponin saponins and N-methylcytisine, a nicotine-like alkaloid found in the roots and seeds. The combination irritates the gut and can stimulate the cardiovascular system.

Warning signs to watch for

Drooling, vomiting, diarrhea and abdominal discomfort. Notable amounts may also produce agitation, tremors, rapid breathing and a fast or irregular heartbeat.

What to do if your dog eats it

Take the plant material away, let the dog drink water and monitor. Contact your vet promptly if symptoms include tremors, agitation or heart-rate changes, not just vomiting.

Common questions

How much blue cohosh hurts a dog?

A nibble of leaf usually causes little more than mild stomach upset, but seeds or root material are more concentrated and deserve a call to the vet even if symptoms seem mild at first.

Can blue cohosh supplements poison a dog?

Yes. Concentrated root extracts contain far more alkaloid than a nibble of the garden plant, so pills and tinctures must be kept out of reach.

More plants checked for dogs

Pothos☠️ ToxicYes, pothos is toxic to dogs. Chewing any part of the vine releases calcium oxalate crystals thaAloe Vera⚠️ Mildly ToxicAloe vera is mildly to moderately toxic to dogs. The skin and latex layer of the leaf contain coSpider Plant✅ Non-ToxicNo, spider plants are non-toxic to dogs. A dog that nibbles the arching leaves is not at risk ofEaster Lily⚠️ Mildly ToxicEaster lilies are only mildly toxic to dogs — they usually cause stomach upset, not the fatal kiSago Palm☠️ ToxicYes — sago palm is severely toxic to dogs, with a documented fatality rate around 50% when untreBoston Fern✅ Non-ToxicNo, Boston ferns are non-toxic to dogs. Chewing a frond will not poison your dog.

This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away. Checking what your pet can eat? Visit our sister site SafeOrToxic.