I happened upon this thread and thought I'd mention that we have a little girl yorkie that does not do well with bully stix either. I don't know if there would be a connection to bullystix, high protein and LS/mvd? (just a thought).
I came across some new information authored by Dr. Karen Tobias on livershunts and mvd. I thought I'd post the link in case it is helpful to anyone. Hope your baby is ok.
LiverShuntAndMVD.com