Here's all the information about the Protein C test:
Comparative Coagulation -- NYS Animal Health Diagnostic Center
If that comes back normal, there probably isn't any need to do any further testing. Just assume Lacy has MVD and go from there. We don't see very many Maltese with shunts, but we do have several with MVD on Spoiled Maltese. All are doing very well with a change in diet and addition of medication (Marin & Denosyl).
I'll be looking for updates!