From what I've read on here, Dr. Tobias at University of Tennessee, is the best person and place to see/go. I'm sure there are other doctors trained by her or other specialists in the field who are also excellent. Here is a link to a PDF written by Dr. Tobias.
http://www.vet.utk.edu/clinical/sacs...2013-09-26.pdf
A thread on YT:
http://www.yorkietalk.com/forums/sic...nt-repair.html
Another thread:
http://www.yorkietalk.com/forums/sic...er-schunt.html
I wish you many happy, healthy years with your baby.