Yes, Prayer Bean is toxic to dogs!
Dogs accidentally consuming the Prayer Bean 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).
Prayer Bean consumption is also toxic to Cats and Horses.
Toxic Principles Of Prayer Bean: Abrin (lectin or a toxalbumin) and abric acid (a glycoside).
More Info About The Prayer Bean Plant
Scientific Name: Abrus precatorius
Family: Leguminosae.
Also known as: Rosary Pea, Buddhist Rosary Bead, Indian Bead, Indian Licorice, Love Bean, Lucky Bean, Seminole Bead, Weather Plant, Precatory Bean.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.