Yes, Poinsettia is toxic to dogs!
Dogs accidentally consuming the Poinsettia plants can show the following clinical symptoms: Vomiting, Prolonged Depression, Incoordination, Hypersalivaton, Sleepiness Or Excitation, Dilated Pupils, Low Body Temperature, Low Blood Pressure, Coma, Seizure And Death (In Rare Cases).
Poinsettia consumption is also toxic to Cats and Horses.
Toxic Principles Of Poinsettia: Irritant sap.
More Info About The Poinsettia Plant
Scientific Name: Euphorbia pulcherrima
Family: Euphorbiaceae.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.
