Of couse "Diefenbaker" was named after one of Canada's crustier prime ministers. He started out the series as a DEAF wolf. I remember looking at the dog and realizing "That isn't a wolf its a sled dog!" and thinking that they might get away with that for the U.S. audience but a lot of Canadians can tell a wolf from a dog. Sure enough, few episodes later Paul Gross' charater was calling Diefenbaker a part wolf and soon enough it became a running joke with Gross saying, with an exasperated look on his face, "I don't know what he is!"
SharonA, I really think that the mounties on Due South, as played by Paul Gross, Gordon Pincent, and Leslie Neilson are Prototypes for the best parts of how Canadians like to see themselves. Polite, fair, accomodating, respectful of other cultures, Self depreciating sense of humour.
Where the motto of the United States is "Life Liberty and the Pursuit of Happiness" Canada's Motto is "Peace, Order and Good Government" There is no greater symbol of that than the Mounties and those three actors have played Mounties so well!