1. Body Temperature. Canine normal body temperature range is 100.5 - 102.5 Fahrenheit (38 - 39.2 Celsius). A body temperature below 100 or above 103F warrants a call to your veterinarian. Body temperature in dogs is most often measured rectally, ear thermometers can also be used, but it can be difficult to get an accurate reading. Gauging body temperature by the moistness of the nose or how warm the ears feel is not reliable. Learn how to assess your dog's body temperature.