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tip #1 wear glasses and something to cover your face, it's cold and you won't like the dog shit in your mouth ;-) I know what I am talking about Cleaning tissues are great to have, since water will be frozen within minutes if you are where I have been.
Be careful to not create frozen breath on the back your camera and keep batteries, and camera if possible, warm inside your coat.
Befere your start, do some test exposures in the white snow, I am sure you are aware of the fact that the bright snow easily causes underexposure.
When travelling in the dark try to stay in as low ISO as possible. There is no use of cranking up the ISO and create more noise but no light in the shadows. If there's no light, there is no light and the spots of bulbs or other lighting source that you carry with you is where the accent of attention should be. Expose for those spots, not for the dark.
Make close ups of the dogs, a portrait of your transport friends is one of the best memory to your trip.
Shooting while moving is nice with shutterspeeds at about 1/15s to accentuate the fact that you move. There will be motion blur, so shoot extra to get keepers.
Anyway, have fun during preparation and EOSfun during the trip!