I'm sorry.
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It is very likely MVD which is just treated with diet and supplements.
I would do a Protein C test to see.
Be careful about doing an ultrasound because they are often inconclusive.
Ultrasound is a great test though if bladder stones (secondary to liver problems) are suspected.
If the Protein C test shows no shunt and MVD is suspected, a liver biopsy could be done during neutering but because this can be risky, you may want to avoid it...
Can you homecook?
Otherwise prescription food is probably best.
Even if it turns out to be mild MVD, I think giving Denosyl or VetriDMG is a good thing to do...