Lymphoma:
Your companion's lymph nodes are all very large. Especially changes in the submandibular and prescapular area but the popliteal lymphnodes and the inguinal lymphnodes are all prominent.
There are two practical rule outs.
The two rule outs are Lymphoma and Lymphosarcoma.
The difference is 6 months on contemporary chemotherapy. Lymphosarcoma doesn't do as well as 'regular' Lymphoma.
I can introduce you to a Veterinary Oncologist. And he's pretty good.
I can also put them on steroid/stomach meds/antibiotics/vitamin c/Colchicine which are all associated with 'more positive outcomes' but still, not even close to curative.
Practically, nothing is curative.
If you decide to 'treat' this with me, on a palliative basis, I'll put together some medications as mentioned above, and we'll get started.
If you'd like to see the oncologist, I'm also all set to refer.
My favorite local oncologist has gone to work with a corporate entity and may be required to suggest a urinalysis, flea bath, skin scrape, neuro exam and a random MRI or CT Scan before getting started. I think you have the right to decline most of those but I'm not sure. Just ask.
If you decide to do nothing at all, that's cool, too. I might do that with my own dog tbh.
Doc Johnson