I would definitely do a bile acid test before ultrasound! That should be your starting point. Your dog has probably has some MVD, besides the shunt, so he will need to be medically managed for the rest of his life. I would just go to your specialist who did the surgery and see what kind of suggestions they would recommend. After the surgery, did they not give you any kind of a follow up testing schedule that would need to done?
If you're seeing a general practicing vet for this, just save yourself the time any money and go straight to your specialist/surgeon.
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