I have a 5 yr old Chihuahua and he is in dire straits!! Thats why I have joined this forum to see if I can find any info anywhere that might help him otherwise I think he may die and so does the vet

He has been "ill" for days and now there is a possible diagnosis of Neosporosis.. the test was not negative or positive but he has a few of the symtoms and is the only thing that has shown in tests, he will not/has not eaten or drank voluntary since early last week, been on a drip every day since monday, had oxygen treatment etc and now a antibiotic which is supposed to help with the neo but he now seems to have slipped backwards this arvo... don't know what to do