Belanger became a professional boxer in 1925 and faced some of the notable light heavyweights of his era. In 1928 he won the Canadian light heavyweight title. Later that year he also picked up the British Empire light heavyweight title by defeating Ted "Kid" Lewis.
He lost three times to Maxie Rosenbloom—who was a light heavyweight champion—but none of those bouts were for a title. He also lost to former middleweight world champion Mickey Walker, split a pair of bouts with former welterweight champion Pete Latzo and future heavyweight title contender Tommy Farr, and defeated former light heavyweight champion Jimmy Slattery. Belanger never won a world title.