The most accurate way to measure a cat’s temperature is rectal measurement. Coat a sterilized thermometer with some erythromycin ointment, insert it 5 cm into the cat’s anus, wait 4 minutes and take it out; or place the thermometer on the cat’s thigh. Root, during this period, control the cat not to move around, wait 3-5 minutes and take it out. You can also use an external thermometer and place it on the cat’s belly to measure.