Represented Australia in the 2003 and 2007 Rugby World Cups. He is most known for his famous drop goal in the 2003 Super 12 season.
He represented New South Wales and Australian schools at the under-19 and under-21 levels.
He was once dismissed from a game after a referee caught him eating a Mars Bar on the field.
His brother Casey Dunning also became a professional rugby player.
He was teammates with Scott Staniforth on the Australian squad that competed in the 2007 Rugby World Cup.