FIP Warning Signs Guide

Cat Not Eating, Feverish, or Suddenly Weak?

These symptoms may be early warning signs of Feline Infectious Peritonitis. Check your cat’s symptoms, review key lab indicators, and understand what to do next.

  • Loss of Appetite
  • Persistent Fever
  • Weakness / Lethargy
  • Swollen Belly
  • Eye or Balance Changes
Overnight shipping available Dosage guidance available Emergency pickup options
The 3-step FIP survival guide for identifying symptoms, confirming lab indicators, and acting fast
FIP Symptom & Lab Check

Match Symptoms with Key FIP Bloodwork Clues

Start with the signs you can see at home, then compare them with key bloodwork patterns often reviewed in suspected FIP cases.

1. Match Your Cat’s Main Signs

Choose the symptom image closest to what you are seeing now.

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Cat not eating near a full food bowl, possible FIP warning sign in cats
Not Eating Loss of appetite or food refusal
Lethargic cat lying down at home, possible FIP weakness warning sign
Suddenly Weak Lethargy, fatigue, or low energy
Cat with swollen belly, possible wet FIP symptom in cats
Swollen Belly Possible abdominal fluid buildup
Cat with cloudy eyes, possible ocular FIP symptom in cats
Eye Cloudiness Possible ocular involvement
Cat showing head tilt and balance issues, possible neurological FIP symptom in cats
Balance Issues Head tilt, wobbling, or unsteady walking

2. Review Common Bloodwork Clues

These markers are often considered together when FIP is suspected.

< 0.7 A:G Ratio

Important FIP Red Flag

A low A:G ratio, especially with high globulin and low albumin, may support further FIP evaluation when symptoms also match.

Inflammation

SAA

Often rises sharply when strong systemic inflammation is present.

Anemia Clue

HCT / PCV

Helps show whether blood cell levels are being affected.

Immune Load

Globulin

Higher levels may reflect strong immune activation.

Protein Loss

Albumin

Lower levels may appear with inflammation, leakage, or organ stress.

Liver Stress

Bilirubin

Elevation may appear in more advanced or complicated cases.

Not sure how to interpret your cat’s signs? Prepare your cat’s weight, symptoms, and recent bloodwork. Our FIP support team can help you review the next step.

How to Treat FIP

Select the appropriate GS-441524 treatment protocol. From emergency pickup to daily oral tablets, we support every step of your cat's recovery.

FIP Treatment Injection GS-441524

FIP Treatment Injection (GS-441524)

Best for: urgent cases, poor appetite, or cats needing fast-start support.

$60.00
Emergency Rescue Kit Local Pickup

Emergency Rescue Kit (Local Pickup)

Best for: local pickup or immediate treatment preparation.

$80.00
50mg Oral Tablets GS-441524

50mg Oral Tablets (GS-441524)

Best for: stable cats that can eat and take oral medication consistently.

$120.00
15mg Mini Tablet Kitten Friendly

15mg Mini-Tablet (Kitten-Friendly)

Best for: kittens, small cats, or flexible dose adjustment.

$150.00

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    FAQ

    About FIP

    What is FIP?
    Feline Infectious Peritonitis (FIP) is a serious viral disease caused by a mutation of feline coronavirus (FCoV).
    How long does FIP treatment take?
    Standard treatment lasts 84 days (12 weeks).
    Is FIP contagious to other cats?
    No. FIP itself is not contagious. mutated virus that causes FIP does not spread.
    Injection or oral GS-441524 — which is better?
    Both are effective. Injections for severe/early stages, tablets for stable cats.
    Is my cat at risk of developing FIP?
    Young cats, multi-cat environments, and high-stress situations are higher risk factors.
    What is the success rate of FIP treatment?
    Success rates reach 95–98% with proper Maxpaw treatment.
    What are the common symptoms of FIP?
    Common signs include persistent fever, weight loss, lethargy, and fluid accumulation.
    Can my cat relapse after treatment?
    Relapse rates are below 5% and can usually be treated with a second course.
    How is FIP diagnosed?
    Diagnosis involves clinical signs, blood work (A:G ratio, Globulin, SAA), and sometimes imaging.
    About Maxpaw
    Learn more about our FIP care approach and dedicated support on our mission page.

    Others

    How much medication should my cat take?
    Dosage is based on your cat's current body weight and FIP type. To make things easier, we provide a dosage calculator to help you determine the correct daily dose.
    👉 Use our dosage calculator here
    Shipping & Delivery
    We offer overnight shipping within the United States to ensure timely delivery during urgent treatment periods. We also offer local pickup service. If you need local pickup, please contact our support team for an arrangement.
    How do I give injections?
    We provide a step-by-step injection guide, including preparation, injection technique, and aftercare tips to help reduce stress for both you and your cat.
    👉 View Injection Guide
    How can I make a payment?
    Making a payment with Maxpaw is easy and secure. Here is our payment information:
    1. Venmo transfer: Search 【@MaxPaw】 from the Venmo app. If Venmo asks for verification, the last 4 digits of the phone number are 7571.
    2. Zelle transfer: olivia@maxpawhealth.com
    3. Credit/Debit card: A payment link will be emailed to you within 5 min after placing an order.