[Ellie May]

This is really an odd situation because the bile acids test was done in August.
It could have changed since then.
Finicky eating and constipation in a dog who has had liver issues would really concern me. Some dogs can go back to a normal diet after surgery but I think 3 weeks is way too soon.

If my dog had shunt surgery, I would avoid red meat and not go with excessively high protein even if he/she were very healthy.

I know you said that you are done with red meat but about the hamburger, it would have to be extremely lean to be okay to give any dog. High fat meats can easily trigger pancreatitis.

There are human foods you can give or mix with his dog food that might entice him to eat.

I would redue the bile acids test if my dog had those symptoms...