Yes, Black Cherry is toxic to dogs!
Dogs accidentally consuming the Black Cherry 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).
Black Cherry consumption is also toxic to Cats and Horses.
Toxic Principles Of Black Cherry: Cyanogenic glycosides found in some species.
More Info About The Black Cherry Plant
Scientific Name: Prunus serotina
Family: Rosaceae.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.