Ask the Vet Video on Blister Beetle Toxicity in Horses

Updated June 5, 2025

In this episode of Ask the Vet, Dr. Lydia Gray and SmartPaker Dan answer a viewer question about blister beetles in alfalfa cubes and hay, in general. The two discuss blister beetles and horses, including where they’re found, when they are most commonly found, and what you can do to make sure your hay isn’t contaminated. Dr. Gray also explains signs that your horse might have eaten blister beetle contaminated hay, and why they’re called blister beetles in the first place.