That sounds weird. I would watch him closely, to see what he's doing when he makes the noise. What's he doing before he makes the noise? Could it be that he's doing this to get your attention? Sounds really odd. You should call your vet and say "I know you said he's healthy, BUT I forgot to mention this weird moaning thing he's doing".
It could be medical even though he had an exam. The vet just does a routine exam if there's no concerns of yours, but he/she won't check everything, or even most things, unless you feel there may be a problem. He could have a UTI, but your vet can't tell that without testing his urine. It could be other medical conditions that your vet would only know about if he did blood work and checked for them.
There's a Vet Chat tonite at 10pm eastern (nine for me here in central) over in Dog Den. Alot of cat people will be there tonite! You should pop in and ask!

Please let me know what you find out!
DestanyF

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