Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today. I do apologize that your question was not answered before.Different experts come online at various times; I just came online, read about your situation, and wanted to help.
First, if Maverick's liver is starting to struggle, you will want to speak to his vet about liver supportive treatments (ie Denamarin, Milk Thistle, SAM-E,etc). Otherwise, in situations like this, we do often treat symptomatically. Since appetite loss in animals with organ dysfunction tends to be related to nausea from toxin build up (which the fluids will help with this), we can find the use of antacids and anti-nausea medication to be of benefit. Therefore, you could at least start him with an antacid like Pepcid, Zantac, or Omeprazole. Otherwise, if he is really fussy, we may need to consider strong anti-nausea medications like injectable or dispense oral Cerenia, Metoclopramide or Zofran/Ondansetron. As well, these dogs can also benefit from the use of appetite stimulants (ie
Mertazipine/mirtazapine). So, those would be option to discuss with his vet to support the liver but also try to get him back to eating for you.
Please take care,