Hello Caroline, I'm Dr. Deb and I'll do my best to help you today.I'm sorry for this concern for Bennie.Normally, I don't become too concerned when a cat stops eating for a day or so, especially if their meow sounds a little different. An upper respiratory infection (aka Feline Flu) can often present this way and most cats will start to feel better within a few days.However, there could be other explanations for his lethargy and disinterest in food ranging from a fever to systemic disease (problem with his kidneys, liver or pancreas, for example).My concern is that Bennie is 13. Older cats don't have the reserves that younger ones do and can become quite debilitated a lot sooner even if something fairly "simple" is responsible for his symptoms.It's possible that something a little more serious may be going on and I wouldn't want him to become more ill if you waited to have him seen. The yellow bile is most likely secondary to an empty stomach and wouldn't necessarily indicate anything more serious than this.I'd advise that you have him seen, if at all possible. A physical exam may detect a problem or your vet may recommend bloodwork which is never a bad idea in a cat ths age.I hope this helps and that he feels better soon.Deb
Thankyou for your reply as Bennie is an older cat I will take him to the vets just to rule out anything nasty.
Caroline: You're welcome. I believe that would be the most prudent course of action.
I hope you'll keep me posted about him after your vet visit.
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Good luck; I hope this won't be anything too serious...I'm sure that this is your fervent hope as well!! Regards, Deb