Here's how to take a cat's temperature:
1. Hind leg temperature measurement method: Take the temperature when the cat is sleeping or not struggling. Shake the thermometer to below 35 degrees Celsius, place it inside the inner hind leg of the cat, and wait 5 minutes to take the reading. The surface temperature of a cat is 0.5 degrees Celsius lower than the rectal temperature, so add 0.5 degrees Celsius to the reading for accurate results. 
2. Rectal temperature measurement: Disinfect the thermometer with alcohol and shake it until the temperature drops below 35 degrees Celsius. Apply a little erythromycin ointment or boiled water to the thermometer to lubricate it. It is best to wait until the cat is asleep, soothe the cat, and once the cat is relaxed, slowly insert the thermometer horizontally into the cat's rectum to a depth of 4-5 cm.
Wait 3 minutes and observe if the thermometer reading has stopped rising. If it has, you can remove the thermometer. Note that cats may resist this method; if using a mercury thermometer, be careful to prevent it from breaking.
3. In-ear thermometer method: Use a cat-specific in-ear thermometer to take the cat's temperature. The in-ear thermometer has a long handle at the tip, which can be inserted more deeply into the cat's ear canal.
When a cat has a fever, it will be lethargic, which owners can tell from its behavior. Therefore, if your cat shows any unusual or uncomfortable symptoms, you should take its temperature first. Generally, a cat's temperature is slightly higher at night and slightly lower in the morning. Adult cats have a slightly lower temperature than kittens. Exercise or stress can cause a cat's temperature to rise temporarily.
A cat's normal body temperature is 38-39.2℃. A temperature of 39.2-39.5℃ is considered a slight fever, and a temperature above 40.5℃ is considered a high fever. If a cat's temperature exceeds 40 degrees Celsius, it is necessary to take the cat to a veterinary hospital for treatment immediately.
