Dolly did not die because it was a clone.
This from a wikipedia entry, allso checked the cited sources there.
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Dolly did not die because of being a clone: an autopsy confirmed she had Ovine Pulmonary Adenocarcinoma (Jaagsiekte), a fairly common disease of sheep caused by the retrovirus JSRV. Roslin scientists stated that they did not think there was a connection with Dolly being a clone and that other sheep on the farm had similar ailments. Such lung diseases are a particular danger for sheep kept indoors and Dolly had to sleep indoors for security reasons. However, some believe the reason for Dolly's death was that she was actually born with a genetic age of 6 years, the same age the sheep from which she was cloned. One basis for this was that Dolly's telomeres were short, typically a result of the aging process.
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