By Linda Chiem ( June 25, 2015, 6:04 PM EDT) -- Valeant Pharmaceuticals International Inc. has reached out to potentially buy animal health company Zoetis Inc., the largest seller of vaccines and medicines for livestock and household pets with a market capitalization of nearly $25 billion, The Wall Street Journal reported Thursday. Valeant reportedly made a preliminary approach to acquire New Jersey-based Zoetis, which spun off from drug giant Pfizer Inc. in 2013, but it's not clear whether Zoetis is receptive to the move or even open to a sale, the WSJ said. Zoetis came under pressure earlier this year from Bill Ackman and his hedge fund Pershing Square Capital Management LP to unlock more value, resulting in Zoetis caving and giving the activist investor a couple of spots on its board to avoid a potential proxy clash. Ackman already is chummy with Zoetis' potential suitor Valeant after they teamed up last year to aggressively pursue a multibillion-dollar takeover of Botox maker Allergan Inc. But they lost out on that target after rival drugmaker Actavis PLC swooped in with a $66 billion offer to buy Allergan in November....