> are any links to it being hereditary?
Not as far as I know but would be interested to find out.
We lost Sam 7 years ago (not current breed) and it seemed to come on quite suddenly. The first sign was that he went off his food and was vomiting. But then that could be anything. We went back and forth to the vet for a couple of weeks before
I found (not the vet) that the lymph nodes in his neck were swollen. After I pointed that out to our vet he then checked the lymph nodes in his chest and back legs; they were enlarged too. The biopsy showed that he had Lymphoma and graded it as the worst possible prognosis.