Rectal temperature measurement: Disinfect the thermometer, apply erythromycin ointment or boiled water, lift the cat's tail, and slowly insert the thermometer into the cat's anus, leaving it for 3-5 minutes; Hind leg temperature measurement: Place the thermometer in the groin of the cat's thigh, close to the skin, and take the reading after 3-5 minutes. 
Because this method provides a relatively accurate temperature reading. First, disinfect the thermometer with alcohol, then shake it until it reaches below 35 degrees Celsius. Apply some petroleum jelly or erythromycin ointment to the thermometer. If you don't have either, just apply some boiled water.
Gently lift the cat's tail and slowly insert the thermometer into the cat's anus, about five centimeters. If you're worried about not being able to get the right depth, you can use your thumb and forefinger to hold the thermometer about five centimeters in, and then stop when you've inserted it to the appropriate length.
Leave the thermometer in the cat's body for 3-5 minutes. It's important to note that if the cat is moving around due to discomfort, the hand holding the thermometer should move with it to avoid breaking the thermometer inside the cat's body.
Cat hind leg temperature measurement methodFirst, shake the thermometer down to below 35℃. Then, place the thermometer firmly against the cat's groin, close to the skin, and read the temperature after 3-5 minutes. Body surface temperature is generally 0.5℃ lower than rectal temperature.
Therefore, you need to add 0.5℃ to the reading to get the cat's actual temperature. It's best to take your cat's temperature this way when they are sleeping or comfortably lying next to you. To soothe them, you can brush their fur or scratch their forehead and chin.
