Zoetis Inc. (NYSE:ZTS), the world's leading animal health company, today announced that its Board of Directors has appointed William F. Doyle, a Member of Pershing Square Capital Management's Investment Team, to the company's Board of Directors, effective February 3. With the addition of Mr. Doyle, the Zoetis Board will expand to 10 directors. Zoetis and Pershing Square reached an agreement providing for Mr. Doyle's election as well as the election in the future of an additional independent director mutually acceptable to Zoetis and Pershing Square.