Dogs are warm blooded animals and hence their body temperatures are maintained at a fairly constant level irrespective of the temperature of their surroundings. A dog's normal body temperature is between 101 degree F and 102 degree F, however, the normal temperature of a healthy dog may range from 99-102.5 F (37.2 degree C - 39.2 degree C). Although healthy dogs have temperatures that varies one or two degrees depending on the time of day, emotional state, level of activity, and environment, any drop or rise or in body temperature beyond these limits should be taken seriously.

Dogs cannot regulate their body temperature by sweating as they do not have sweat glands on their body except on their paws. They must maintain their body temperature by panting to take the excess heat out. If he can not get rid of the heat fast enough, his body temperature rises rapidly. A rise of 3 degrees to a temperature of 105 degree F is enough to cause a potentially serious condition. At this temperature, the dog cannot effectively reduce his body heat, the oxygen demand goes up beyond control and the body temperature continues to rise.

At 108 degree F, it may be permanently disabling or even fatal for the dog. All the vital organs such as the heart, brain, liver, and kidneys start failing and even quick treatments at this point would not be able to prevent permanent damage. Lastly, a word of caution; never leave your dog locked up in a hot car or in an unventilated area on a hot day. In this case, panting would not be helpful in reducing the dog's body temperature and the poor thing may suffer a heat stroke.