Majorcan hellebore poses severe toxicity risks to humans, cats, and dogs. All parts contain protoanemonin, leading to poisoning through contact or ingestion. Symptoms include severe gastrointestinal distress, skin irritation, dizziness, and disorientation in humans; severe physical distress in cats; and vomiting, diarrhea, abdominal pain, and potential fatality in dogs. Immediate medical or veterinary care is essential.