Yes, Mistletoe “American” is toxic to dogs!
Dogs accidentally consuming the Mistletoe “American” 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).
Mistletoe “American” consumption is also toxic to Cats and Horses.
Toxic Principles Of Mistletoe “American”: Toxalbumin, pharatoxin viscumin (Lectins, Phoratoxins).
More Info About The Mistletoe “American” Plant
Scientific Name: Phoradendron flavescens
Family: Viscaceae.
Also known as: American Mistletoe.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.