Strange question...does it almost sound like a goose honking? When Zingo was younger he would do that. At first I thought it was connected with an extremely active play session, he just got too wound up. But it wasn't. It would be kind of out of the blue. Then he out grew it. Now Hunter, who is about 2, has been doing it. Again can't connect it with anything specific. I had taken Zingo to the vet when he was doing it. They could find no exact cause and since it wasn't an all the time thing they didn't want to medicate him without being sure they needed to. DOn;t know if that helps, but it was our experiences with the honk!!!