Overview: Updated 2025 welfare assessment for FIP in cats, transformed by the availability of antiviral treatments.
Key Welfare Facts
FIP was historically a uniformly fatal disease causing severe welfare compromise before death within weeks to months.
Antiviral drugs including GS-441524 and remdesivir have transformed FIP from fatal to highly treatable since 2020.
The wet form causes pleural or abdominal effusion causing respiratory distress and abdominal discomfort.
The dry form causes neurological signs, ocular disease, and organ failure depending on affected tissue.
Treatment with antiviral drugs over 84 days achieves sustained remission in over 85% of treated cats.
Access to effective treatment is improving globally but cost remains a barrier for many cat owners in 2025.
Welfare Assessment
FIP treatment represents one of the most dramatic welfare improvements in feline medicine. Accessing antiviral treatment as early as possible after diagnosis gives the best chance of remission and return to excellent quality of life.
What You Can Do
Seek immediate specialist veterinary assessment if FIP is suspected based on symptoms or fluid analysis
Discuss GS-441524-based antiviral treatment as the current standard of care for confirmed FIP
Commit to the full 84-day treatment course even if signs resolve early to prevent relapse
Access financial support schemes if treatment cost is a barrier to accessing this life-saving therapy