I had a Siberian back when I was in college. Best dog ever! We didn't sled, but I skijored her a little bit. She loved it! I had no balance and fell all the time, she would sit down and wait for me to get up, then stand at the ready until I said "hike", then we would fly down the trail till I lost it again, and she would sit and watch me get up, then stand at the ready until I said hike, then we would fly down the trail ... you get the picture.