Animal Health Industry What is the big 4 in veterinary medicine? March 5, 2026 by pups | Leave a Comment The "Big 4" in veterinary medicine typically refers to the four major pharmaceutical companies that dominate the animal health market: Zoetis, Elanco, Boehringer Ingelheim Animal Health, and MSD Animal Health (Merck Animal Health). These companies develop and distribute a vast array of veterinary pharmaceuticals, vaccines, and other animal health products globally. Understanding the "Big 4" […] Read more »