 After Dolly the sheep was cloned in 1996 , scientists had managed to clone numerous other animals , including cats , cows , gaur , horses , mice , mules , pigs , rabbits and rats but had been unable to successfully clone a dog due to the problematic task of maturing a canine ovum in an artificial environment . After several failed attempts by other scientists , Byeong Chun Lee , a professor of Seoul National University , were able to successfully create a clone using tissue from the ear of a 3 @-@ year @-@ old Afghan hound . 123 surrogate mothers were used to carry the embryos , of which 1 @,@ 095 were implanted , the procedure resulted in only three pregnancies ; one resulted in a miscarriage , the other pup was born successfully but died of pneumonia three weeks after birth , the successful clone was carried by a Labrador Retriever . From the original 1 @,@ 095 embryos to the final two puppies , this placed the success rate of the project at less than two tenths of a percent . Snuppy was named as a portmanteau of the initials of the Seoul National University ( SNU ) and the word " puppy " . 
