http://www.nytimes.com/2005/08/03/science/03cnd-clone.html?hpSouth Korean Scientists Create World's First Cloned Dog
By GINA KOLATA
Published: August 3, 2005
In a tour de force, a team of South Korean researchers reports it has cloned what scientists deem the most difficult animal of all - the dog.
It was a feat that took nearly three years of intensive effort, seven days a week, 365 days a year. Dogs have such an unusual reproductive biology, scientists say, that the methods that allowed them to clone sheep, mice, cows, goats, pigs, rabbits, cats, a mule, a horse and three rats, and to create cloned human embryos for stem cells, simply do not work with them.
South Korean scientists announced on Wednesday they had created the world's first cloned dog, the 67-day old Snuppy.
Other cloning researchers said they were in awe of the South Koreans' effort and dedication. Some had tried to clone dogs, but given up in despair.
Lee Beyong Chun, the first author of the dog cloning paper, published today in Nature, says he and his colleagues began the process on Aug. 2, 2002, supported by a grant from the South Korean government. Working nonstop and using 1,095 dog eggs, they finally ended up with a baby Afghan hound that is a clone of an adult male Afghan.