“He looks like a dingo.”
“What?”
“When he’s on his back like that. Looks like a dingo.”
The roomie was right. He does. So when Lomax gets in a wiggly mood and rolls onto his back in the middle of the living room floor, snorting and trying desperately to touch the tip of his nose to the tip of his tail, we call it the Dingo Dance. Sometimes there’s a toy involved — the Nylabone ring, the delicious rubber Orbee bone — and sometimes he just goes solo.
LabradorRodeo 
Ah, around our house we call it the belly rub roll.
We always think the upside-down dog looks like a bat!