A cat that changes its behavior, becomes apathetic, or refuses to eat can quickly become a cause for concern. However, it's not always easy to know if a cat has a fever without the proper equipment. Unlike humans, fever in cats is harder to detect with the naked eye. Knowing how to recognize the signs and adopting the right reflexes can help you act quickly and prevent a worsening of their health.
Summary
How to tell if a cat has a fever: signs
Normal temperature and reliable measurement
Causes of fever in cats
What to do if your cat has a fever
How to tell if a cat has a fever: conclusion
How to tell if a cat has a fever: signs to look for
Even before measuring their temperature, certain visible signs can alert you. A feverish cat often exhibits unusual behavior. They become calmer, even lethargic, and show less interest in their environment.
The most frequent symptoms
- Loss of energy and unusual fatigue
- Refusal to eat or decreased appetite
- Ears warm to the touch
- Dry nose (to be relativized)
- Faster breathing
- Isolation and withdrawal
These signs are not enough to make a diagnosis, but they provide valuable clues to understand if your cat has a fever. A sudden change in behavior is always a signal to take seriously.
If these symptoms are accompanied by a very degraded general condition, it may be useful to consult this complementary article on the signs of a dying cat and its care.

Normal cat temperature and how to measure it correctly
The only reliable way to determine if a cat has a fever is to measure its body temperature.
Normal temperature
In cats, the normal temperature is between 38°C and 39.2°C. Above 39.5°C, it is considered a fever.
How to measure temperature
- Use a digital rectal thermometer
- Apply a little lubricant
- Gently hold the cat
- Gently insert the thermometer
This method may seem restrictive, but it remains the most accurate. If you do not feel comfortable, consult a veterinarian.
According to the National Order of Veterinarians, taking the temperature is essential to confirm a suspected fever.
The causes of fever in cats
Understanding why a cat develops a fever allows for a better response. Fever is not a disease, but a symptom.
The most frequent causes
- Bacterial or viral infections
- Internal inflammations
- Parasites
- Chronic diseases
- Following an injury
In some cases, fever can appear after a vaccination or significant stress. This is then considered a temporary reaction.
A healthy cat, well-equipped and regularly monitored, is less exposed to these risks. For example, a personalized cat collar allows for quick identification in case of loss or emergency, facilitating care.

What to do if your cat has a fever
If you suspect a fever, it is important to act quickly but without panicking.
Good reflexes
- Monitor their behavior
- Measure their temperature
- Keep them calm
- Hydrate them regularly
It is essential never to:
- Give human medication
- Wait several days in case of high fever
- Ignore persistent symptoms
A veterinary consultation is recommended if:
- The fever exceeds 39.5°C
- It lasts more than 24 to 48 hours
- It is accompanied by severe symptoms
A quick diagnosis helps to avoid complications and ensure appropriate care.

How to tell if a cat has a fever: conclusion and prevention
Knowing how to tell if a cat has a fever is essential for any attentive owner. The signs can be subtle, but regular observation and good knowledge of your animal make all the difference.
In summary:
- Observe changes in behavior
- Check temperature
- Consult quickly if necessary
Prevention also involves regular follow-up, appropriate nutrition, and a healthy environment. A well-monitored cat is a healthier cat.
Ultimately, understanding how to tell if a cat has a fever allows you to act quickly, avoid complications, and most importantly, effectively protect your companion every day.
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