In what will be the largest IPO since Facebook's $16 billion public offering, Zoetis is going public tomorrow, and will be the largest stand-alone animal health business in the industry. In this video, Motley Fool health-care analyst David Williamson gives us his take on this business, and how it stacks up to some of its competition in the animal health industry. He shows us what shares could look like, and warns us of the hazards of playing the risky IPO game.