A once-fatal feline disease, now treatable
Oct 21, 2025
The feline disease FIP was previously a death sentence — now, thanks to a revolutionary treatment and PAWS Chicago’s expert care, little Wallabee’s story is one of hope and healing.
When Wallabee came to PAWS Chicago at the end of June through our Community Outreach program, he was a typical playful kitten—curious, bright-eyed, and recovering from an upper respiratory infection. But just as he was finally ready for his neuter surgery, our veterinary team noticed something alarming: his abdomen was distended. Tests revealed a buildup of fluid, and the diagnosis was one that used to be a death sentence: Feline Infectious Peritonitis (FIP).
FIP is a devastating disease caused by a mutation of the feline coronavirus (FCoV) that turns the immune system against the body. For decades, it was considered fatal, with no approved treatment and very few survivors. But that’s changing. A groundbreaking medication, GS-441524, was recently approved for use in the United States, offering hope for cats like Wallabee for the first time.
Thanks to PAWS Chicago’s advanced medical resources and expert veterinary team, Wallabee was able to begin treatment right away. The 12-week course of oral medication directly targets the virus rather than just easing symptoms, and within days, Wallabee began to rebound. His appetite returned, his energy soared, and the fluid in his abdomen disappeared. He’s now wrapping up his final doses and will soon be cleared for neuter and adoption. Luckily, he won’t be waiting long for his adoption day. While recovering in a foster home, his foster mom fell in love with him and plans to make him a permanent part of the family!
Stories like Wallabee’s show how PAWS Chicago continues to push the boundaries of what’s possible in animal medicine. By providing access to emerging treatments and the highest standard of care, we’re giving pets who once had no chance the opportunity to live long, healthy lives.
You can help us continue providing lifesaving care and cutting-edge treatments for pets like Wallabee by donating.