Congrats! I think you will have a very pretty little thing when he grows up as well as a cute little guy now!
My rescued shih Tzu came straight to me at 6-weeks of age after a puppymill raid. She has very few issues. I have always said that she has been healty as a horse once I stopped feeding her grapes.
She is very shy and quiet around strangers. We wondered if she even knew how to bark for the first few weeks.
Now that she is a grand old lady of almost 13 years she has had cateracts and glacoma which required an eye removal but she has done very well since then. I would even venture to say that in total we have spent less money at the vet with her than any other dog we have had.
Good luck with your little one and post some photos for us.!