Yes, Pink Pearl is toxic to dogs!
Dogs accidentally consuming the Pink Pearl 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).
Pink Pearl consumption is also toxic to Cats and Horses.
Toxic Principles Of Pink Pearl: Soluble calcium oxalates.
More Info About The Pink Pearl Plant
Scientific Name: Begonia semperflorens cultivar
Family: Begoniaceae.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.