As a veterinary pathologist, your duties are slightly different depending on whether you work in small or large animal veterinary medicine and whether you run a practice that deals mainly with pets or a business that involves consulting and research services for a rancher or other livestock operation. As a small animal or family practice pathologist, your responsibilities are to diagnose diseases in animals. You study tissue samples from organs and body fluid to reach a diagnosis. In livestock veterinary pathology, a veterinary pathologist studies herds for communicable diseases that may affect production. Some veterinary pathologists work for the FDA or other federal programs to investigate outbreaks.