The objective of the study was to determine the frequency of infectious diseases confirmed by laboratory analysis at the Clínica Veterinaria Docente Cayetano Heredia (CVDCH) in the period 2014 to 2017. The medical records were chosen considering that they are legible, with complete information and diagnosis laboratory confirmation of infectious disease (s). The variables considered in the study were grouped into patient information (origin, age group, sex, breed, and seasonality of care) and the definitive diagnosis of infectious disease (s) according to their etiology. 307 medical records were obtained from patients with confirmatory diagnosis (es) for the study period. The cases were more frequent in 2014 and 2015 and came from districts of North Lima. Most patients were race- defined adult males. In autumn the highest frequency of cases of infectious diseases was reported. The...