Purely an assumption, but the closest seems to be post nasal drip.
Also, if somebody was just reading handwriting and the D was really an O, could it be pneumonia...
That's about all that makes sense. Not a common abbreviation in vet med that I know of.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |