>wasn't there a cartoon set in the Yukon. The main character was a Mountie.

Sgt. Preston of the Yukon (not a cartoon) was undoubtedly a point of reference for Dudley Do-right of the Mounties, part of the Rocky and Bullwinkle cartoon empire.
edit:[see jheem's link, below]
http://www1.tpgi.com.au/users/cnicholl/sgt_preston_of_the_yukon.htm