Hmm, that sounds about right, that's how I described it to the vet, like a furball - except for the higher pitched noises, it's almost like he's whistling. It's been going on (on and off) for a few weeks now but with no discernible pattern. Day, night, asleep, after running, after walking, after sitting. In my home, at my trailer on the lake... I've been looking for a pattern but I just don't see it. It does seem to be getting slightly less frequent though and we'll be around the vet I trust most next weekend, if it doesn't stop completely by mid-week I'll take him in next Saturday. Thank you for the details Dee, it helps with perspective