I highly recommend doing the bile acid testing. It is a relatively inexpensive test and not stressful to the pup at all.
Here is a link to my Teddy Bear's story. Teddy was diagnosed with a liver shunt in 2013. I had adopted him in 2007 and during those years he had 8 full blood studies done with no abnormalities at all! It means nothing ... some vets are really not aware of that...any specialist will tell you it happens quite a bit. It is all dependent upon how much blood is going through the liver and being filtered.
http://www.yorkietalk.com/forums/sic...ver-shunt.html
The only symptoms Teddy ever exhibited were GI and I missed it....it was not that often and not until it got worse and then he had
the bladder stones. Poor baby.