Why it's dangerous
The toxins interfere directly with the electrolyte balance within the heart muscle, specifically affecting the sodium-potassium pump, which can lead to life-threatening heart rhythm abnormalities and high potassium levels.
Toxic compound: Cardiac glycosides (cardenolides or bufadienolides)
Good to know
All parts of the plant are toxic, including the water in a vase containing the plant. The toxins are similar to digitalis or digoxin.
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.