Glad to here that you might be able to convince the hubby not to.

Breeding responsibly will cost you a lot of money. There are way to many unhealthy shih tzu's out there, you never no if your adding to that problem without hips, eyes, heart, and other testing that will cost you quite enough. Why not neuter him, it may save you a lot of money in the long run, he could end up getting a testiculer cancer if not neutered.