The world's first cloned dog, Snuppy, has been cloned again. Three out of four "reclones" of Snuppy are alive and well. The researchers plan to monitor them for many years to determine if clones and "reclones" have health problems or shorter lifespans compared to regular animals.

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The world's first cloned dog, Snuppy, has been cloned again. Three out of four "reclones" of Snuppy are alive and well. The researchers plan to monitor them for many years to determine if clones and "reclones" have health problems or shorter lifespans compared to regular animals.