Cat FIP Types
Feline infectious peritonitis (FIP) is commonly described in four clinical presentations. This page summarizes the key features of Wet (Effusive) FIP, Dry (Non-effusive) FIP, Ocular FIP, and Neurologic FIP, and links to detailed guides for each type.
Important: All content is provided for educational purposes only and does not replace professional veterinary diagnosis or care.
Four Clinical Presentations
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Wet FIP (Effusive)
Abdominal or chest fluid · Often faster onset · Most common presentation
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Dry FIP (Non-effusive)
Granulomas · Slower progression · Can be harder to recognize early
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Ocular FIP
Uveitis · Abnormal pupils · Vision changes · May occur with wet or dry
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Neurologic FIP
Ataxia · Tremors · Seizures · Gait changes · Often requires advanced evaluation
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Note: Some cats show mixed features. Ocular and neurologic involvement can occur alongside wet or dry presentations.
Wet vs Dry: Practical Comparison
High-level differences (educational overview)
Wet FIP (Effusive)
- Fluid accumulation in abdomen (ascites) and/or chest (pleural effusion)
- Abdominal enlargement and/or breathing difficulty may be prominent
- Often more rapidly progressive in many cases
- Fluid analysis can provide strong supportive diagnostic information
Dry FIP (Non-effusive)
- Inflammatory granulomas may affect organs (kidneys, liver, lymph nodes, intestines)
- Weight loss, fever, lethargy can be more subtle or chronic
- Diagnosis may require imaging + lab trends + clinical integration
- Ocular/neurologic involvement may occur with dry disease
Ocular & Neurologic Involvement
May occur in either wet or dry presentation
Ocular FIP
- Eye inflammation (uveitis) and abnormal pupil responses
- Cloudiness, redness, or visible changes inside the eye
- May accompany systemic signs such as fever or weight loss
- Requires veterinary eye exam for accurate assessment
Neurologic FIP
- Unsteady gait (ataxia), weakness, tremors, or seizures
- Head tilt, circling, altered behavior or awareness
- May require MRI/CT and cerebrospinal fluid (CSF) evaluation
- Urgent veterinary assessment is recommended for rapid progression
What the “Type” Means for Evaluation
How type influences the diagnostic pathway
If fluid is present
Imaging + abdominal/pleural fluid analysis are commonly prioritized to support evaluation.
If no fluid is present
Lab trends + imaging for granulomas/organ changes + differential exclusion may be emphasized.
If eyes or nerves are involved
Specialized exams and, in some cases, advanced imaging may be recommended by a veterinarian.
FAQ
Short answers (educational)
Can a cat have more than one “type” of FIP?
Yes. Some cats show mixed features. Ocular or neurologic involvement can occur alongside wet or dry presentation.
Is wet FIP always more severe than dry FIP?
Not necessarily. Both can be serious. Severity depends on progression, organ involvement, and overall clinical stability.
Do types determine treatment?
Types help guide evaluation and monitoring. Treatment decisions should be made with a licensed veterinarian based on the individual case.
References & Medical Disclaimer
Authoritative sources (educational)
- Cornell University Veterinary Medicine
- Merck Veterinary Manual
- VCA Animal Hospitals
- ISFM (International Society of Feline Medicine)
- AAFP (American Association of Feline Practitioners)
Medical Disclaimer
Important: All content is provided for educational purposes only and does not constitute veterinary diagnosis, treatment, or medical advice.
Always consult a licensed veterinarian regarding your cat’s health and medical decisions.