Like human medicine, there are numerous specialty fields in Veterinary medicine, such as Nutrition, Internal Medicine, Dermatology, Cardiology, Oncology, Ophthalmology, etc. These veterinarians complete their four years of veterinarian school, followed by a four-year residency program. They then face a grueling two-day board exam. This elite group of specialists will have an extra letter after their DVM degree that is associated with their specialty field. They are usually part of the AVMA or the AHVMA, along with their specialty association.