How to Check Your Cat's Temperature Without a Thermometer

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Your cat hasn't been their usual whirlwind of energy, dashing across the room to chase their favorite toys. The rattle of their food bag fails to bring them running to their dish. If your cat is acting sick, you might want to check to see if they are running a temperature.

How can I check the temperature of my cat?

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A thermometer is the most accurate method for checking your cat's temperature.​ The most accurate way to gauge a cat's body temperature is by using a rectal thermometer, but many cat owners aren't comfortable taking the temperature this way at home. It can also be hard to keep your cat calm enough to take their temperature with a rectal thermometer. ​I​f you don't have a digital thermometer or don't think your cat will stand for you to take their temperature, there are other ways to tell if they have a high fever.

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Ear thermometers are another option, but they need to be positioned correctly to give an accurate temperature reading. They use an infrared sensor that measures the temperature of the eardrum (tympanic membrane). To use one, you need to pull the flap of the ear down slightly to allow the sensor to reach the eardrum; otherwise, you may be taking a reading of the wall of the ear canal, and this isn't always accurate.

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Reasons a cat may have a high temperature

A healthy cat's temperature should be 100 to 102.5 degrees Fahrenheit. If it's higher than that, it's likely that they are running a temperature and are ill. Symptoms of fever in cats include lethargy, loss of appetite, decreased grooming, and shivering. Like humans, cats run a temperature when their immune system kicks in to fight a disease or pathogen.

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A high temperature may also indicate that your cat is experiencing hyperthermia. This isn't a true fever, but it is still characterized by a temperature that is running dangerously high. Hyperthermia can be caused by heat stroke or seizures. In some cases, it is the result of a rare condition called malignant hyperthermia. This can be triggered by excitement, anxiety, exercise, or environmental stress.

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Your cat may have an infection caused by a bacterial infection, which is most likely the result of an infected wound. It may also be the result of a virus, such as feline leukemia or feline immunodeficiency virus. Fevers can also spike due to a fungus, an injury, a tumor, or a disease like lupus, although these causes of fever are less common.

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Without a thermometer, it will be difficult to tell just how high a fever is, but a visit to the veterinarian is in order if you see other signs of fever, if your cat is sick for more than a couple days, or if they refuse to eat or drink.

A cat's dry nose may be a sign of a fever

Cat noses are usually cool and moist, which you may notice when your cat nudges you with their nose to get up and play or feed them at 3 a.m. But a sick cat's nose is often dry and warm when they have a fever.

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However, sometimes a cat's nose is dry if they are dehydrated. Try gently lifting some fur and skin on your cat's back over the shoulder blade area. If it doesn't snap back into place quickly, they may be dehydrated rather than feverish.

To get a better idea of what normal skin elasticity looks like in a properly hydrated cat, test this on your cat when they are well. This will help to prepare you to better recognize a problem in the future. If your cat is getting older, this may be harder to identify, as cats can experience reduced skin elasticity with age.

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Checking for a cat fever

When your cat is well, place a finger on the inner side of their ear. It will feel warm. But when they have a fever, it will feel noticeably hotter, similar to when you feel a person's forehead to see if it's hot when fever is suspected. Like their ears, your cat's back may also feel warmer than usual to the touch if a fever is present.

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But first, make sure your cat hasn't been napping in their favorite sunny spot or in front of a furnace vent. This can cause your cat's ears and back to feel warmer without a true fever.

Your cat's shivering and fast breathing may be signs of trouble

Sometimes, cats who spike a fever start to breathe more quickly or pant. But some cats will pant or breathe heavily when they are extremely stressed without a fever. This may happen on the way to the animal clinic if your cat is anxious in the car or even once you have arrived to see your veterinarian.

As in humans, shivering might also be a sign of fever. But this doesn't only occur when a cat's temperature rises. They may also tremble or shake from fear or stress.

What your cat can expect at the veterinarian

If you spot these signs and your cat is not acting well, it is time to go to the veterinarian for a thorough evaluation and accurate temperature reading. Your veterinarian will go over your cat's medical history, including contact with ill animals, allergies, vaccinations, and recent illnesses. They will likely order a complete blood count and biochemistry panel as well as a urinalysis. If the cause of the illness isn't clear, scans such as an ultrasound, MRI, CT, or X-ray may be performed to get a better look at what's going on internally.

If your cat's fever is due to a bacterial infection, the most common treatment is antibiotics, often in combination with intravenous fluids. Sometimes, an injection of a long-lasting antibiotic is given, or antibiotic pills must be given to your cat once or twice a day. But antibiotics will not be used if the fever is only the result of a viral infection.

If the cause is not an infectious agent, such as a tumor or auto-immune disease, the underlying cause of the fever will be addressed.

Do not give your cat any medications, like anti-inflammatories, unless you have been specifically directed by their veterinarian. Some medications that are often taken by humans for fever, like Tylenol, are toxic to cats.

The bottom line

If you suspect that your cat has a fever but don't have access to a thermometer, there are other signs that you can watch for. This includes a dry nose, hot ears or back, shivering, or rapid breathing. If you suspect that your cat has a fever, contact your veterinarian. They will identify the cause of the fever and the best treatment option. Avoid giving your cat any medications unless your veterinarian specifically directs you to do so.

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