Dolly ( July 5 , 1996 â `` February 14 , 2003 ) , was a sheep remarkable in being the first mammal to be cloned from an adult somatic cell , using the process of nuclear transfer . Dolly ( 5 July 1996 â `` 14 February 2003 ) was a female domestic sheep , and the first mammal to be cloned from an adult somatic cell , using the process of nuclear transfer .