Pet Health

FIP in Cats (Symptoms & Treatment)

Discover the signs of FIP in cats and learn effective treatment options. Understand symptoms, diagnosis, and caring for your feline friend through this challenging time.
Author: Veterinary Team
Dial A Vet
Updated
June 6, 2025
|
Published
June 6, 2025
Cat exhibiting symptoms of FIP, such as lethargy and eye issues, in a cozy home setting.

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As a cat owner, hearing about feline infectious peritonitis (FIP) can be overwhelming. This serious viral disease has left many pet parents feeling confused and worried, especially when their beloved cat starts showing unusual symptoms. But the good news is that advances in veterinary medicine have made it easier to understand, diagnose, and, in some cases, treat FIP. Let’s break down everything you need to know to help your cat.

⚠️ What to Watch For

FIP in cats is caused by a mutation of the feline coronavirus (not related to COVID-19). While many cats infected with feline coronavirus show mild or no symptoms, in some cases, the virus mutates, leading to FIP. This disease can affect cats of all ages but is most common in young cats under two years old or those with weakened immune systems.

The symptoms of FIP depend on whether it presents as "wet" or "dry" FIP:

  • Wet FIP: Fluid buildup in the chest or abdomen, causing a swollen belly or difficulty breathing.
  • Dry FIP: Inflammation without fluid buildup, leading to symptoms like lethargy, weight loss, fever, or neurological signs.

Common signs of FIP include:

  • Loss of appetite
  • Fever that doesn’t respond to antibiotics
  • Lethargy and weakness
  • Weight loss
  • Swollen abdomen (in wet FIP)
  • Difficulty breathing
  • Neurological symptoms like seizures, tremors, or uncoordinated movement
  • Eye inflammation or changes in vision

Because these symptoms overlap with other conditions, it’s crucial to consult a vet for a proper diagnosis.

🔍 Possible Causes

FIP is caused by a mutation of the feline coronavirus, which is a common and typically harmless virus in cats. This virus is spread through feces, saliva, and shared litter boxes, making it more prevalent in multi-cat households or shelters. However, only a small percentage of cats exposed to feline coronavirus develop FIP.

Factors that increase the risk of FIP include:

  • Age: Kittens and young cats are more susceptible.
  • Stress: Changes in environment or new additions to the home can weaken a cat's immune system.
  • Breed: Certain breeds, like Bengals and Ragdolls, may be more predisposed.
  • Weakened immunity: Illness or poor overall health can increase vulnerability.

Understanding these risk factors can help you take preventative steps, especially if you have multiple cats in your home.

✅ What You Can Do at Home

If you suspect your cat may have FIP, there are some steps you can take at home to support their comfort while seeking veterinary care:

  • Ensure your cat has access to fresh water and palatable food. Warming up wet food or offering highly appetizing options like chicken broth can encourage eating.
  • Provide a stress-free environment. Keep your home quiet, avoid sudden changes, and ensure your cat has a cozy, safe space to rest.
  • Monitor symptoms closely. Keep an eye on any changes in appetite, energy levels, or breathing.

While these steps can help in the short term, FIP requires veterinary attention. Don’t delay seeking professional advice if your cat’s symptoms persist or worsen.

💡 When to Call a Vet

If your cat is showing any signs of FIP, contact your veterinarian immediately. Early intervention can make a significant difference in your cat’s quality of life and potential treatment outcomes. During the vet visit, you can expect diagnostic tests such as bloodwork, imaging (like X-rays or ultrasounds), and analysis of fluid if wet FIP is suspected.

Though FIP was once considered untreatable, advances in antiviral medications, like GS-441524, have shown promise in managing this disease. These treatments require close veterinary supervision, as they may involve a lengthy course of injections or oral medications.

In the meantime, your vet may recommend supportive care to keep your cat comfortable, including:

  • Fluids to address dehydration
  • Appetite stimulants
  • Anti-inflammatory medications
  • Pain management

Remember, time is critical. If your cat is struggling to breathe, has a swollen abdomen, or shows severe neurological symptoms, seek emergency veterinary care immediately.

FAQs

Q: Can FIP be prevented?
A: While there is no guaranteed way to prevent FIP, minimizing stress, maintaining good hygiene, and ensuring your cat is in good overall health can reduce the risk. For multi-cat households, regularly cleaning litter boxes and providing separate spaces for cats can help limit the spread of feline coronavirus.

Q: Is FIP contagious to other cats?
A: The mutated form of feline coronavirus that causes FIP is not directly contagious. However, the original feline coronavirus can spread between cats, so it’s important to maintain good hygiene in multi-cat environments.

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References

While every effort is made to ensure the accuracy of this content - including vet review where applicable - this article is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is unwell or you are concerned, please speak with a licensed veterinarian. You can book a $49 online consultation with our veterinary team  😄
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