Zoetis sells anti-infectives, vaccines, parasiticides, diagnostics, and other health products for animals. The firm earns roughly 35% of total revenue from production animals (cattle, pigs, poultry, and so on), and nearly 65% from companion animal (dogs, horses, cats) products. Its U.S. business is heavily skewed toward companion animals, while its international business is slightly skewed toward production animals. The firm has the largest market share in the industry and was previously Pfizer's animal health unit.