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Hi. My name is***** I'm very sorry to hear about this situation with Casper. I can honestly say that you're in a situation that is the hardest one to be in as an owner. When do you let him go? It sounds like he's not doing well. With that diagnosis of the FIP, he's not going to do well as it will be a progressive disease. It sounds like his overall quality of life is not good at this point. I tell owners that they a pet should be social, eating, drinking, comfortable, and able to enjoy the days to have a good quality of life. If Casper has been deteriorating despite all the therapy that has been done to this point, it doesn't look good. Some owners will fight down to the last tooth and nail to have their pets around. Others will look at the overall picture and make a quality of life decision much sooner. You wouldn't be wrong to have your vet let him go if he's doing this poorly at this time. What did they say about his situation when he was being treated with the IV's?
You are the one that is there seeing how he's doing. If he's failing, then it may be time to let him go. The antibiotics are helping with any secondary infections that may be present. If everything is due to the FIP, then there is really nothing that can stop the progression of that devastating disease. I know you don't want to give up on him, but it sounds like letting him go is the best thing for him. You've given him the best chance you and your vets could.