I disagree. ZTS only produces Animal Health, which is a fraction of PFE with much limited scope. With enough disagreement from share holders, PFE might decide to spin-off ZTS and give a few shares to each share holder.
Charles Schwab asked me if I could take PFE's share exchange with Zoetis (I am not familiar to it), I am wonder whether I should exchange all of PFE shares? I know PFE is now good shape. your opinion would be much appreciated!