Wrote the below before reading the rest of the learned comments, but Veterinarian wisdom might support my hunch.
“Even a blind dog may stumble upon a dead rat” as my old dad says.
Thank you for all the wisdom
@srvet @Buchan
You may well be right
@baguio.
I’ve only had one old warrior muntie with septic joints (to make a physio weep) and it’s entirely possible that his pre-scapular glands were enlarged for other reasons (it was years ago and all others were normal as I recall).
With age and weakened constitution perhaps there were residual bacteria in the joints, causing the enlargement.