I know what you say about being so nervous about your little ones surgery. I felt like I was going into surgery myself, in fact worse. If they want to do a full workout on his overall health---do it. They are tiny and I had pre-op work done. My guy is 5 lbs and his bladder is about the size of a jelly bean so imagine your babies at only 3 lbs. I don't blame you for being scared to death for him I was too, but I'm sure he will be fine. Most yorkies that I've read or heard about do well. My situation with the allergy to the stitches is very rare. I am not that familiar with liver shunt, so I hate to comment on that. As for the stone surgery be prepared for him to be in a lot of pain the first night and it is very hard to take emotionally, but by the next morning you will see a big difference. Hugs to you and your baby, let me know what happens.