People doctor
A people doctor was a slang term for a doctor who cared for sentient lifeforms, particularly Humanoids, rather than animals (such as dogs), as a veterinarian would. 

In 2152, Jonathan Archer was surprised by the level of Dr. Phlox's medical training in Interspecies Veterinary Medicine (six degrees), as he had believed Phlox to be a people doctor. ()
Medical occupations
Slang