With animals, surveillance is important for their survival and well-being. Monitoring helps to improve the consistency of the surgical outcome, thereby improving the quality of data obtained from each animal. Anesthetics induce depression of the central nervous system, cardiovascular and respiratory system in animals, and temperature regulation is also inhibited in many species, causing hypothermia and related cardiac and respiratory changes. Thus, monitoring vital signs such as heart rate, core body temperature, and respiratory rate are critical to animal welfare, especially to ensure survival and rapid recovery after surgery. Due to the importance of monitoring vital signs, several manufacturers are releasing innovative veterinary monitoring equipment.