Zoetis Inc. is engaged in the discovery, development, manufacture and commercialization of animal health medicines and vaccines, with a focus on both livestock and companion animals. The Company has a diversified business, marketing products across over eight core species: cattle, swine, poultry, sheep and fish (collectively, livestock), and dogs, cats and horses (collectively, companion animals), and within over five product categories: anti-infectives, vaccines, parasiticides, medicated feed additives and other pharmaceuticals. It operates through two segments: the United States and International. Within each of these segments, it offers a diversified product portfolio for both livestock and companion animal customers. In addition, its Client Supply Services (CSS) organization provides contract manufacturing services to third parties. It also offers other product categories, such as nutritionals and agribusiness.