The mandatory supervised internship demonstrates to be a fundamental moment in a student's life. In this sense, the full performance of the professional is experienced in order to prepare the newcomer for the job market. The present work describes the activities carried out during the Mandatory Supervised Internship - ESO, anesthesiology sector carried out at the Veterinary Hospital of UFRPE (HOVET) and at the Chatterie Veterinary Clinic, under the supervision of veterinarians Rômulo Nunes and Thaygo Marçal, respectively. The total workload was 420 hours, divided into 210 hours for each location, from February 14 to May 5, 2022. A case report was made on neonatal anesthesia in a patient with anal atresia, an uncommon pathology in dogs and cats whose anesthesia has implications related to the unique physiology and the particular needs of neonates. A quick and effective intervention taking into account all the peculiarities, is essential, since this pathology is incompatible with life and the anesthetic procedure is essential for the surgical treatment.
