In 1949, Dunn was made a King's Counsel in Quebec by Maurice Duplessis. He was a made a member of the bar in five provinces. On 15 August 1950, he was made a Freeman of the City of Bathurst, and in November 1954 the same honour was bestowed by St. Andrews, New Brunswick. The University of New Brunswick, Dalhousie University, St. Francis Xavier University, Laval University and Queen's University all granted him honorary degrees. Sault Sainte Marie awarded him the Freedom of the City.