The device adopts mainstream method to measure end-tidal carbon dioxide(EtCO2) and airway respiratory rate(AwRR). It can monitor the pet’s ventilation function, reflect the condition of pulmonary circulation and pulmonary blood flow, and indirectly reflect the alveolar ventilation. It has important application value in clinical anesthesia, cardiopulmonary cerebral resuscitation, prehospital emergency care, ICU and post-anesthesia of pets. It connects with the pet’s respiratory tract through the air adapter and respiratory connection tube.