Yes, Hops is toxic to dogs!
Dogs accidentally consuming the Hops 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).
More Info About The Hops Plant
Scientific Name: Humulus lupulus
Family: Cannabidaceae.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.