My bunny (4 1/2 months) made this sound last night, very short amount of time, and she's done it about once before a while ago. I had her out running on my bed, and as she was running, she made this really weird sound. She may have been just trying to catch her breath, but it almost sounded like a snort-wonking sounded. Almost a light version of a snore, or breathing through a kazoo or in through a harmonica. I just want to make sure her lungs are okay, and it isn't her breathing...I don't think she was mad at me, she was licking me, climbing on me,and in one of her better moods toward me last night.