In 26 years as a lacrosse player with the New Westminster Salmonbellies, New Brunswick-born George Rennie won five national championships and was selected to help represent Canada at the 1908 Summer Olympics. There he earned a gold medal with his team after it won its only match against Great Britain 14-10. He served in World War I, which interrupted his tenure with the Salmonbellies that had begun in 1901, but returned to the club after the conflict. He later served as an officer with the Royal City Adanacs lacrosse club and was inducted into the Canadian Lacrosse Hall of Fame as a charter member in 1966.