Always nice to hear a happy ending to a story, even more nice that you are sharing your story in hopes to help others some day dealing with this same issue. Too kind!!
You mentioned your breeder had never heard of Liver Shunt, wow!! And also never having a sick puppy. I've never heard of a breeder having a success perfect rate of 100%, but maybe the breeder is new. Also, in no way am i trying to bash your breeder, this just caught my attention. There is always two sides to the story so I will give the breeder the benifit of the doubt to be more nice about it, LOL.
I am so glad to hear Max is doing great and he is so very lucky to have you as his Mommy!