Yes, Climbing Bittersweet is toxic to dogs!
Dogs accidentally consuming the Climbing Bittersweet 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).
Climbing Bittersweet consumption is also toxic to Cats and Horses.
Toxic Principles Of Climbing Bittersweet: May contain euonymin and sesquiterpene alkaloids.
More Info About The Climbing Bittersweet Plant
Scientific Name: Celastrus scandens
Family: Celastraceae.
Also known as: Bittersweet, Waxwork, Shrubby Bittersweet, Bittersweet, Climbing Bittersweet, American Bittersweet.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.