Yes, Mother-In-Law Plant is toxic to dogs!
Dogs accidentally consuming the Mother-In-Law Plant 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-In-Law Plant consumption is also toxic to Cats.
Toxic Principles Of Mother-In-Law Plant: Bufodienolides.
More Info About The Mother-In-Law Plant Plant
Scientific Name: Kalanchoe tubiflora
Family: Crassulaceae.
Also known as: Mother of Millions, 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.