Why it's dangerous
The plant contains cardiac glycosides that affect heart function and compounds that act as dangerous purgatives with strong laxative effects.
Toxic compound: Cardiac glycosides
Good to know
All parts of the plant are toxic; it is currently on the FDA's unsafe herb list. Cardiac effects are particularly noted in herbivores.
Sources
This page is informational and is not veterinary advice. If your pet has been exposed to something risky, contact your vet or an animal poison control line right away.