A dog's normal body temperature range varies depending on age and the site of measurement.

Puppy dogs, that is, dogs between zero and four months old, due to their rapid body metabolism, their normal body temperature averages between 38.5℃~39.5℃. The normal body temperature of adult dogs is relatively low, generally between 37.5°C and 38.5°C. Older dogs, that is, dogs older than seven years old, may have a body temperature between 37.5°C and 39°C due to the aging of their internal organs and weakened metabolism.

Please note that these are just general reference ranges. Your dog's body temperature may vary due to many factors (such as exercise, excitement, tension, etc.) and temporarily increase. If the dog's body temperature exceeds the normal range, let the dog cool down for about 30 minutes and then take the temperature again. If the dog's body temperature exceeds the normal range after 2 to 3 consecutive measurements, and the change is small, it may be a pathological increase in body temperature, and it is recommended to take the dog to a doctor for treatment in time.