Yes, Mother of Millions is toxic to dogs!
Dogs accidentally consuming the Mother of Millions 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).
Mother of Millions consumption is also toxic to Cats.
Toxic Principles Of Mother of Millions: Bufodienolides.
More Info About The Mother of Millions Plant
Scientific Name: Kalanchoe tubiflora
Family: Crassulaceae.
Also known as: Mother-In-Law-Plant, Kalanchoe, Devils Backbone, Chandelier Plant.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.