I just heard this very loud noise, I actually thought it was a motorcycle going really fast down our street. It scared Oscar so that he ran and hid under my feet at the desk. It stopped for a few seconds and then started up again. That was when I realized it was coming from Chester! He must have been dreaming his little doggie dreams in the kitchen. When I went in to check on him he looked all bleary eyed at us! Poor guy, what a dream that must have been.