Question: are buttercups poisonous to horses?
Answer: Buttercups can cause mouth pain and blisters, drooling, oral and gastric ulcers, colic, and diarrhea. Horses are one of the most sensitive species to Ranunculus' gastrointestinal effects. These effects can be severe if horses ingest buttercups in large quantities, but their acrid taste usually deters further grazing.