Hi Moshi and welcome to Pet Talk. I hope you aren't feeling a little overwhelmed with the responses so far, but most, if not all of us would not be in favor of you breeding your dog. I think probably first and foremost, if you aren't already a professional breeder who is trying to better the breed and know exactly what you are doing, you are probably going to make mistakes. Breeding is serious business. I know others will add more to this topic and the subject of homeless pets, back yard breeders, disease, etc. will come up but I just wanted to welcome you to Pet Talk as we really are a nice bunch of people. If you would like, please feel free to post a picture of your little shih tzu. We love pictures and would enjoy meeting him!