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