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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
It sounds like there were probably some increased liver enzymes. This is not an uncommon finding in older dogs with routine bloodwork. It could be Cushing's, but without the typical increased thirst/ urination/ appetite/ panting signs, I don't think I would go chasing that diagnosis.
You can have the surgery done without ruling out Cushing's. The difference would be that you're using liver friendly medications and lower doses on things like Valium or Midazolam just in case the liver enzyme elevation is actually due to decreased liver function. The rest of the anesthetic protocol would be the same and I wouldn't expect any adverse reactions or difficulty recovering.
I hope this helps, let me know if you have any other questions.