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Hello. Thanks for the question.
Advantix is not a medication that is known to cause vomiting. With that said, we can see adverse reactions to any medication depending on how an individual dog reacts. If this is a mild reaction, it should go away on it's own over 24 hours.
If you want to give something today to help settle his stomach, you can use over the counter Famotidine (Pepcid)- 5 mg orally.
I hope this helps, let me know if you have any other questions.
Gotcha. With the current liver disease, maybe she didn't metabolize it fully and that is what caused the vomiting. No matter the cause, it should resolve on it's own and be pretty mild. I'm not worried about anything serious or long lasting.