Beating Hurdles, Scientists Clone a Dog for a First
New York Times, August 4, 2005

Dogs have such an unusual reproductive biology, far more so than humans, scientists say, that the methods that allowed cloning of sheep, mice, cows, goats, pigs, rabbits, cats, a mule, a horse and three rats, and creation of cloned human embryos for stem cells, simply do not work with them.
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[Snuppy.] Not Snoopy. The scientists named him for Seoul National University puppy.

Cloning researchers were awed at the achievement, but not everyone shared their admiration.

http://snipurl.com/gpnr

Pigs and sheep, a horse and a cow
They've all been cloned, but up until now,
A dog stumped them all.
Now a clone which they call,
Snuppy, is barking bow wow.