Yes, Winter Cherry is toxic to dogs!
Dogs accidentally consuming the Winter 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).
Winter Cherry consumption is also toxic to Cats and Horses.
Toxic Principles Of Winter Cherry: Solanine.
More Info About The Winter Cherry Plant
Scientific Name: Solanum pseudocapsicum
Family: Solanaceae.
Also known as: Natal Cherry, Jerusalem Cherry.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.