Amelia Taylor – Cornell University College of Veterinary Medicine
Cats are skilled at hiding discomfort, which makes it difficult for pet parents to know when something is wrong. A fever is one of the body’s natural ways of fighting infection, but since cats can’t tell us when they feel unwell, you need to rely on observation and subtle changes in their behavior. Knowing how to tell if your cat has a fever helps you take quick action before the condition becomes serious.
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What Is a Normal Temperature for Cats
A healthy cat’s body temperature typically ranges from 100.5°F to 102.5°F (38°C to 39.2°C). Anything above 103°F (39.4°C) is considered a fever. If your cat’s temperature goes above 104°F (40°C), it can become dangerous and requires immediate veterinary attention.
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Warm Ears, Nose, or Paws
You might first notice your cat’s ears, nose, or paws feeling unusually warm. While this alone isn’t enough to confirm a fever — since cats’ body temperatures fluctuate throughout the day — it can be an early clue, especially if it’s accompanied by other symptoms.
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Lethargy and Low Energy
Cats with a fever often become sluggish and less active. You may find your normally playful cat sleeping more, hiding in quiet corners, or avoiding interaction. This exhaustion comes from their body focusing energy on fighting infection.
Loss of Appetite
A sudden decrease in appetite or refusal to eat is another common sign of fever. Cats that don’t eat for more than 24 hours can develop liver problems, so it’s important to encourage hydration and contact your vet if the issue continues.
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Shivering or Trembling
Fever can cause chills just like in humans. If your cat is trembling or shivering despite being in a warm environment, it might be their body’s way of regulating temperature.
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Dehydration
When a cat has a fever, they lose fluids more quickly and may not drink enough to replace them.
How to check:
• Gently pinch the skin at the back of your cat’s neck.
• If it doesn’t spring back immediately, your cat may be dehydrated.
Other signs include dry gums and reduced urination.
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Rapid Breathing or Panting
Fever can make your cat’s breathing faster than usual. If your cat is panting or breathing heavily while resting, it could indicate that their temperature is elevated or they’re feeling stressed or unwell.
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Grooming Less Often
Cats usually groom themselves frequently, but when they’re not feeling well, they may neglect their hygiene. A messy or dull coat can be a sign of fever or other illness.
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Checking Your Cat’s Temperature Safely
The most accurate way to determine if your cat has a fever is by using a digital rectal thermometer designed for pets.
Steps:
- Apply a small amount of lubricant (like petroleum jelly) on the thermometer tip.
- Gently insert it about half an inch into your cat’s rectum while keeping them calm and still.
- Hold it until the reading is complete. If your cat’s temperature is above 103°F (39.4°C), contact your vet immediately.
If you’re uncomfortable taking a rectal temperature, your vet can do it safely. Never rely solely on touch to determine fever, as fur can mask body temperature changes.
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Common Causes of Fever in Cats
• Bacterial or viral infections
• Inflammation or abscesses (often from bites or scratches)
• Internal infections in organs like the liver or kidneys
• Heat exhaustion
• Reaction to vaccination (mild and temporary)
Your vet can run tests to determine the cause and prescribe antibiotics or supportive care as needed.
