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The tow dogs who work California's Donner Pass brave the elements and the competition. Towing is a cut-throat business here, with more than ten local companies fighting for financial survival. In this Hell on the Highway best-of episode, the extremely competitive side of towing in the Sierras is revealed, as tow dogs are pitted against one another in a race for rescues that only the best will win. (National Geographic)
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Photo © National Geographic Channel
![Hell on the Highway - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/162/786/162786791_f06d00.jpg)
Photo © National Geographic Channel
![Hell on the Highway - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/162/786/162786792_09c025.jpg)
Photo © National Geographic Channel
![Hell on the Highway - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/162/786/162786793_bcaab8.jpg)
Photo © National Geographic Channel
![Hell on the Highway - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/162/786/162786794_a3db66.jpg)
Photo © National Geographic Channel
![Hell on the Highway - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/162/786/162786795_158bd8.jpg)
Photo © National Geographic Channel
![Hell on the Highway - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/162/786/162786796_a9a42c.jpg)