Sergeant Preston of the Yukon

In 1955, the same year the radio show ended, Sergeant Preston of the Yukon premiered as a television series. Richard Simmons starred as Sgt. Preston, and was supported by Yukon King and Rex, now played by real animals. The dog cast as King was not a husky, however, but a large Alaskan Malamute. Charles Livingstone, who had worked on the radio version, directed several episodes. Though no plotlines seem to have been re-used from the radio show, they were generally built upon the same themes. The same few buildings were regularly seen as part of many settlements in the shows. The additional visual component of the snowy Yukon, however, did give the television version a different feel but like all such films when filmed on a stage set, the frosty breath of people in Arctic conditions could not be simulated. Generally however there was an outdoor feel though a few times you did see shadows on the skyline. Genuine outdoor scenes were added to give the show some reality though you could not help but notice a sameness to them as they were all filmed in the same area and reused at times.

Mainly filmed at Ashcroft, Colorado, the series was telecast on CBS from September 29, 1955 to September 25, 1958. The first two seasons were produced by Trendle-Campbell-Meurer and the show was broadcast in the same time slot that The Lone Ranger was shown on rival network ABC.
From: Wikipedia.org