Yes, Horse Chestnut is toxic to dogs!
Dogs accidentally consuming the Horse Chestnut 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).
Horse Chestnut consumption is also toxic to Cats and Horses.
Toxic Principles Of Horse Chestnut: Aesculin (a glycosidic saponin), other saponins.
More Info About The Horse Chestnut Plant
Scientific Name: Aesculus glabra
Family: Hippocastanaceae.
Also known as: Buckeye.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.
