A regular blood test will show ALT, AST, BUN... levels. ALT and AST have to do with liver function. These do not have to be elevated even if there is a problem though. I would do this blood test anyway.
The blood test that needs to be done is a bile acid test. You dog is fasted for twelve hours (overnight) and blood is drawn, fed a meal and blood is drawn two hours later. If these numbers are elevated too much then more testing should be done.
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