Dig holes at least 5 feet apart along the line of the new Clusia hedge. Is clusia poisonous to dogs? Lilly of the Valley (Convallaria majalis) is a popular holiday plant that is toxic to dogs and requires aggressive treatment. blood, anorexia, hypersalivation, depression), Balsam pear (vomiting, painful abdomen, diarrhea), Barbados Aloe (can change urine color to red, vomiting), Barbados Lily (vomiting, salvation, diarrhea, convulsions //