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Hello and thanks for trusting me to help you today. I am a licensed veterinarian with over 25 years experience and would be happy work with you. It is really impossible to comment on his prognosis for recovery without knowing more about his current state of health and if there may be more than a simple URI occurring. Hepatic lipidosis has to be a concern, especially if he was/is overweight and his calorie intake has been compromised for long enough. Also if he is retrovirus positive, that would certainly have a negative effect on his improvement.
You are also correct that if he is weak enough that he can't stand, he should be closely monitored or even better yet hospitalized. If he does have the beginnings of hepatic lipidosis, aggressive nutritional support is needed and adequate calories cannot usually be provided by syringe feeding alone. The best way to help this guy would be to have bloodwrik run to evaluate his organ function and retrovirus status as well as getting him on fluid and nutritional support.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.