The pathologist veterinarian (veterinary surgeon specializing in pathology) studies the nature, cause and development of diseases or deaths in animals. He thus analyzes tissues or biological fluids (medical biologist) and isolated cells, in order to establish diagnoses, determine sources of infection and contamination and recommend prevention methods. urine, blood) and examines tissue fragments (skin, liver, intestine, tumor, etc.) under a microscope, also called biopsies. Once collected, these tissues are then prepared using a very specific method so that they can be observed correctly (precise cutting, alcohol and paraffin baths, staining, etc.). He then interprets the results and makes diagnoses. In the event of an animal’s death, it is also the pathologist veterinarian who intervenes to carry out the autopsy. He can also carry out epidemiological investigations and advise veterinarians as well as working staff. in the field of animal health or in that of breeding. Finally, He is also involved in the analysis of drugs before they are placed on the market (to check that they are neither toxic nor carcinogenic) and does research on vaccines and serums.