Classical or traditional virology has been greatly complemented by some molecular techniques such as the Polymerase Chain Reaction (PCR) and the way in which precise molecules can be detected in an unambiguous way. The design of specific primers has also left behind any pretext to attempt the detection of a pathogen of human or animal interest. Veterinary medicine students are incorporated through the development of their title memories on topics such as those mentioned, taking as a basis the pathogens that mainly affect dogs and cats. Among the agents already studied, the canine distemper virus and the canine and feline herpes virus stand out. However, others have also been studied: Canine parvovirus, Feline panleukopenia and other non-viral agents such as Bordetella canis, Brucella canis or Leptospira interrogans, for example.