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