Turn your first dog into a stellar role model and take half the work out of raising the second puppy.

Dozens of animals have been cloned since that first lamb—mice, cats, cows and, most recently, a dog—and it's becoming increasingly clear that they are all, in one way or another, defective.

A South Korean laboratory that produced the world's first cloned dogs is looking to get into the business of cloning canines, first by cloning drug - sniffing dogs, a lab official said on Tuesday.