Sentence:  The steer dog next to the sleigh prevents this by immediately leading off at a sixty-degree angle from the direction the others are going, thereby compensating for the sidewise stress and keeping the <WSD>toboggan</WSD> in the clear until the bend has been passed. 
Meaning of the word marked with <WSD> tags:  A similar sled of wood, pulled by dogs, possibly with steel runners, made to transport cargo.