But there is this forgotten film, named, "Kazan," 1921, starring a bunch of Radissons, which I also find intriguing. In the film, Kazan is a special dog. This film was made back when dogs, like Rin Tin Tin, and the cold New Frontier, were all the rage.
However, if you look at the Wiki page, it kinda looks like this 1921 movie was based on a 1949 novel. Wut??