Answer:
It leads to the Boy's fall through the ice into the lake.
Step-by-step explanation:
In this story, we learn that the boy decides to go up the lake because he is bored at home. This action leads to the boy falling through the ice and into the lake. This is how the plot moves forward. Although the dog cannot help him get out, he is successful in rallying enough people that can help out and thus save his friend.