I have a kitty named mittens neutered and think he has fip he has the swollen for 4 months now I took him to vet they drew the yellow fluid from his abdomen I didn't have the money to test it vet said make him comfy till he goes his belly swells and went down some before but this time it hasn't gone down any we keep him kenneled overnight because he peed the bed but he's always Hungry and I let him out during the day and he tries climbing on the bed I have to help him I read the kitties need more protein so I just got some fresh pet food with real chicken and other natural ingredients hope this helps him I have 9 other cats with no symptoms he's the only one and he was outside with others maybe he got it from a stray cat or animal or if he ate a mouse would they get it from them I don't want to give up on him but I will put him down if he won't get up or eat till then I rub his belly and he paws my side till bedtime