Aloha! You're speaking to Dr. Michael Salkin
Can you upload a copy of her test results to our conversation? I understand that you might not have a copy of the results at home but his vet should be able to give you one which you could scan into your computer and give me the link or you can photograph the page(s) and upload the images by using the paperclip icon in the toolbar above your message box (not if you're using the chrome browser) or by using an external app such as imgur.com or dropbox.com.
Hepatomegaly (liver enlargement) can arise secondary to inflammation, infiltration, congestion/obstruction, infection, or hyperplasia of the liver. It can also be a benign and incidental finding. The Zentonil Plus contains SAM-e which is a hepatoprotective agent. We don't have any studies concerning its efficacy but it won't be harmful. There are too many possible etiologies of those changes to list in this venue! I might be able to narrow down those possibilities after reviewing her test results.
Front leg lameness
is, indeed, worrisome for a cervical (neck) disk in any doxi and particularly one with a history of having already suffered a cervical disk prolapse/rupture. Of course if all of her disks in her neck have already been removed, a disk shouldn't be considered but, instead, post-surgical osteoarthritis and aging changes in her neck might be incriminated.
Pragmatically speaking, I'm going to provide a nonsteroidal antiinflammatory drug (NSAID) and opiate analgesic for such a dog. I want to see a positive response within 10 days of initiating therapy. If I don't see such a response, X-rays or even MRI are indicated. Not giving her the pain pills because it might cover up a problem is "old school" thinking...I'm going to get in trouble with your husband...Kozmo needs the antiinflammatory action of an NSAID lest she worsen unnecessarily. You can still watch for paresis (weakness) or paralysis
which would necessitate further diagnostics and possibly another surgery.
Please respond with further questions or concerns if you wish.