Pet safety answer · Cited to ASPCA
Is Mistletoe safe for dogs?
Why it's toxic
Toxic principles: toxalbumin, pharatoxin viscumin (lectins, phoratoxins)
Clinical signs in dogs: vomiting, diarrhea, low blood pressure (rare), difficulty breathing, low heart rate
Severity rating: severe
Source
Classification per the ASPCA Toxic and Non-Toxic Plants database entry for Mistletoe. Verified 2026-05-28. We update these answers when the source changes the classification.