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JERSEY CITY, NJ - JULY 24:  A pit bull looks out from a cage in the Liberty Humane Society shelter July 24, 2007 in Jersey City, New Jersey. According to animal shelter statistics, around one-third of all dogs coming into shelters nationwide are pit bulls, up from just 2 to 3 percent fifteen years ago. An estimated 40,000 people are involved in illegal professional dogfighting in the U.S. which often involves pit bulls. (Photo by Mario Tama/Getty Images) Mario Tama/Getty