According to some of the stuff I have read on the net, the people who say they started this breed (and they ALL claim that), say that the mom must be a Shih-tzu and the dad a Yorkie in order to make a Shorkie. According to that definition, my dog is not a yorkie because his mom was the yorkie and his dad was the Shih tzu. I imagine they would say that two shorkies will not make a shorkie. I think it would make a shorkie but eventually you would lose the "hybrid vigor," if you even believe in that. Also, it would be hard to tell what kind of dog you would get as I guess it could revert to more Yorkie or more Shih tzu than either parent is. I wanted to breed my little Shorkie because he is so cute and sweet, but I am having him neutered on January 5th. I think there are plenty of dogs out there waiting for homes, and from what I read, breeding puppies is no cake walk. Nothing against those who choose to breed there shorkies, I don't blame you and I may even ask to buy one from you in the future...LOL. Seriously, I really hesitate to have Mai Tai neutered as I would love more of him. Hope my rambling has helped a little. If you find any answers please let me know.