I'm sorry to hear about your dog. My 12 year old has MVD and other issues so I know the feeling. How high was your baby's bile acids?
I'm in New England so don't have any direct names for you on long island but here is the link to the listing of ACVIM board certified veterinary internists in NY so you can see who is in your area. I would only take my dog to a diplomat of the ACVIM for this issue.
ACVIM