Question

why do you think he gives the harness bells a shake​

Answer 1

Answer:

please mention the chapter name

Answer 2

Answer:

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The horse is shaking his harness bells to ask if stopping is a mistake.

The clue to why the horse is shaking his harness bells is in this line from the third stanza.

He gives his harness bells a shake.

To ask if there is some mistake.

The horse has likely shaken his head in order to make the bells jingle. He is likely cold and does not want to stop in the woods here. It is uncommon to just stop in the woods like this. Therefore, the horse is worried about his master. Horses are very intuitive animals. They can tell when their masters are worried.