Who is the vet at VSS that specializes in DM

I think any of them would know about DM. You can always call, too, or look up their website.

DM could be an abbreviation for several things. If degenerative myelopathy, that would be neurology. If diabetes mellitus, then internal medicine. They have it all!

Internal medicine, Dr Gringerich

You'll likely want to ask for someone in internal medicine.

Sorry, don't know what a DM is.