A gastroenterologist treats diseases of the stomach.
Psychiatrist treats the diseases of your mind.
An oncologist treats cancer patients. Pediatrics is children's medicine. A pediatric oncologist would treat children who have cancer.
A cardiologist is a doctor who specializes in diagnosing and treating diseases and conditions of the circulatory system, including the heart and blood vessels.
radiologist
A podiatrist is an expert who deals with diseases of the feet.
eat my nutsack
A Doctor who treats animal diseases and injuries is a veterinary surgeon (British English) - or Vet for short.
Pediatrician.
medical doctors
Epidemiologist
A doctor - or a podiatrist.