1.   Although the project started with Missy, cloning dogs has proven scientifically tougher than cloning cats.

2.   For at least one man, the price tag of cloning his dog could be millions.

3.   For those reasons and more, Sperling wants to clone the dog.

4.   It will take another year or more, Ayares said, before a dog is cloned.

5.   Robl, who founded a company to commercialize aspects of livestock cloning, said he has had requests for a decade to clone dogs.