A dog's normal body temperature is between 101°F and 102°F. Any drop or rise or in body temperatuure should be thoroughly investigated by a veterinarian.
You can tell a raised temperature only by checking the lower abdomen or the inside of the thighs.If these areas feel unusually warm even when the dog hasn't been exercising you should take the dogs temperature. (which can be unpleasant...)
Use a thin, ubreakable thermometer.The digital kind with the signal tone is best because it reacts more quickly than regular ones.Lubricate the tip with Vaseline.Then hold the standing dog steady (it helps to have two people),lift up it's tail,and insert the thermometer,at a slight upward angle,a little over 1 inch (3 cm) into the rectum.The regular old fashioned thermometers have to be kept in place for 2 to 3 minutes.A digital thermometer can be removed after one minute (after the sound of the signal).If the temperature is above 102.2'F (39 'C) in a small dog or or above 101.3 'F (38.5 'C) in a big dog,this has to be considered a fever.A temperature that is below normal (below 100.4 'F or 38 'C) can also be a sign of illness.How to euthanize a dog at home?
for a dog it's 101.2why does my dog lick herself down there?