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My cat has FIP/cancer but is improving. When is it time? FIP meds?

Updated on September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 7 months and 10 days old | 4.2 lbs

After a hospitalization at Blue Pearl after a serious decline in his health, Watson is believed to have dry FIP or cancer. However, he's really improving with supportive care. Like, a 180. How will I know when his time has truly come? Also, I researched about polyprenyl immunostimulant...do vets generally have the ability to prescribe it as part of treatment?

1 Answer

Most Helpful Answer

Sara Farmer, DVM

Answered By Sara Farmer, DVM

Veterinarian

Published on November 17th, 2018

In situations like this you can take it a day at a time - as long as Watson seems to be doing well (enjoying his normal routine, interacting with you and other family members or pets, eating and urinating/defecating normally) you can continue with supportive care. If the bad days outnumber the good it may be time to consider euthanasia.

Polyprenyl immunostimulant has shown some promise when used for the dry form of FIP - I believe it is more readily available than it was a few years ago but most veterinarians have not used it. There is also a newer experimental drug that seems to show promise being developed at the University of California Davis. The specialist at Blue Pearl might be able to look into each therapy further for you. Either way you would probably want a definitive diagnosis first since these would not help cancer, and that might involve exploratory surgery to obtain biopsies.
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