Feline infectious peritonitis was once nearly universally fatal, but antiviral treatments have revolutionized the prognosis, transforming a welfare crisis into a treatable disease for many affected cats.
The development of effective FIP treatment represents one of the most dramatic welfare transformations in veterinary medicine in decades. Cats that would have died within days to weeks now have realistic prospects of long-term remission. The welfare burden of FIP pre-treatment - progressive effusive disease, respiratory distress, and wasting - has become avoidable for many cats. Access barriers including cost remain significant, but the existence of treatment options fundamentally changes the welfare calculus for cats diagnosed with FIP. Owner advocacy for access to licensed formulations is an important ongoing welfare effort.