Summary

Roles of drug testing in an equine pre‑purchase evaluation, highlighting its importance in determining whether a horse is truly suitable for a buyer’s intended use. Drug testing helps identify medications that may mask pain, lameness, injury, or alter behavior, which could otherwise invalidate the physical and behavioral assessment of the horse. Screening commonly targets non‑steroidal anti‑inflammatory drugs (NSAIDs) and sedatives or tranquilizers, but can also include analgesics, anesthetics, and anabolic steroids upon request. Blood samples are most often used, with urine required for some tests, and laboratories detect drugs using methods such as ELISA or thin‑layer chromatography. Turnaround times vary by drug class and laboratory, ranging from a few days to over a week, with expedited options available. The decision to pursue drug testing ultimately rests with the buyer and should consider the horse’s value, history, and intended purpose.