Identifying the cause of a pyrexia of unknown origin (PUO) in dogs and cats presents a considerable diagnostic challenge. The diagnostic workup can be frustrating for veterinarians and clients, especially when it fails to reach a final diagnosis after extensive testing. Fortunately, most causes of PUO can be found or treated successfully. This webinar discusses PUO and provides information about common causes and the diagnostic approach. This webinar is provided by BSAVA Education Partner IDEXX.