The scientific breakthrough, led by biomedical scientist Woo Suk Hwang (who was later dismissed from the university for fabricating data on cloning human stem cells), was as laborious as Snuppy was adorable. Snuppy the puppy marked the single success out of 123 attempts spanning three years. Since then the gangly puppy has sired nine puppies of his own with two cloned females, marking the first successful breeding between clones.
Read about the other nine top science dogs in this slide show at Scientific American. Link -via Digg