Yukon Quest
... that the Yukon Quest is considered the toughest sled dog race in the world?
... that the <b id="mwFz0"><a href="./Yukon_Quest" id="mwFz4" rel="mw:WikiLink" title="Yukon Quest">Yukon Quest</a></b> is considered the toughest <a href="./Sled_dog" id="mwFz8" rel="mw:WikiLink" title="Sled dog">sled dog</a> race in the world?