Answer:
The broom dog helped Canton with his anxiety, which came about when her mother (Ms. Post) was swept off by a school bus.
Step-by-step explanation:
The "Broom Dog" is part of the story in "Look Both Ways." It centers on the character of Canton and his "broom dog" which he named "Dusty."
Mr. Munch gave him the "broom" and pretended that it was a dog in order to support him emotionally. Whenever he watches his mother step into the street, Canton would feel anxious and would then run down his fingers through the broom. This made him feel better.