There, Sorry if this is long or if i have too many questions,

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There, Sorry if this is long or if i have too many questions,

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Hi there,
Sorry if this is long or if i have too many questions, but i am going crazy here.
Have a stray cat that we neutered and took care, she had sneezing on and off. She gave birth to 7 babies. 2 were still born, 4 looked fine and one was the runt of the litter. We found home for all except, Big Head, the runt.
I don't know if i can attachs photos, we called him BH because his body was tiny he never grew. At 7 months and 17 days old he weighed approximately 900 grams. He seemed to have laboured breathing. We loved him, and we build him a lovely garden house where he lived with the gang. All day we brought him up and inside, he slept in his villa with his blankets, closed house with a lovely door opening only at nights.
We take him to the vet, he runs tests and we go back after a week for the results. He says FIP. Gives us a pill a day for 2 months IMMUNOVET and 2 tiny pieces of prednisole twice a week, small dose. He also did an x-ray and said there is air in his stomach and that generally BH is small obviously for his age etc. His words "will be ok one month up one months down".
After the vet and for 2 months, i realised he liked sitting next to the heater (it is warm in Greece), we noticed some days he had a big belly like a tennis ball (bigger than what he is), his breathing i don't know he moved his abdomen more than other cats, and 10 days or so he becaun urinating everywhere in the house in some corners (he didn't do that in the past he used a litter tray). More symptoms...he had like a nervous tick bending his head on one side when chewing and he made a loud noise with his mouth like a krats krats krats certain times of day. He also had huge eyes (i don't know if this is neurological). Last month or more he became a bit weaker. He either got let in, in the morning from the communal door and was smart enough to find my door and miow and be let in all day. Or would be always always always waiting by the communal door outside and be fed in the back at the villa. He jumped the ledge and off he went. Last 6 weeks he could not jump the ledge, he basically jumped up to a height that his front legs latched on then pulled himself up. If you ask me that would mean his hind legs got weaker when his front legs were as strong as ever. He also found spots in the sun to sit until i went down to get him, in the morning.
Another thing, he always always always ate like a champ, he would never stop eating but he never grew he looked like a 2 month old kitten, maybe he grew a bit in length but had a boney back and ribs even when he had days of a big belly. His miow was like a screech.
Like a kittens miow at best.
Monday night, as always, he ate all day, ate dinner then i took him down to the villa. I put him in while leaving i looked back and he was out looking left and right completely normal.
In the morning 8am he did not come outside my flat door and screech to be left in the neighbour walking his door as always went down to communal door and BH was not there. 10 am i went down he was not waiting for me and then i went to the villa and no BH.
I am going crazy...in the building we have 2 dogs that absolutely love him lick him play. There are 2 buildings in the plot, one further right that BG never wondered off too he always stayed in his area.
I called the vet first he said....he felt bad and hid. We have been looking 2 days a few people incg by inch, there are many stuff downstairs as owner is a hoarder but we have covered all bushes, inlets, everything, some places inside wood we could not go into. I hear no screeching from BH. Doctor said give him a chance. BH no food and water one approaching 2 days now no chance. Then he said with FIP you can die suddenly. I do not agree he was eating at 8pm normally he vanished between 9pm and 7am. He behaved normal. If he died suddenly he would die in his house or close by if he felt bad...he was dependent on us, not street wise he would not hide not to be found and i really dont think he hid.
Could he have died?
Thanks
Paris