The intensive pronoun is bolded below.
The author use an intensive pronoun in this passage to emphasize that Nick is responsible for the dog.
An intensive pronoun is known to be that pronoun that tells or bring one back to the subject of a sentence so as to explain or emphasize it.
Note that The intensive pronoun is So you yourself need to make sure that she is walked and fed every day and the author use an intensive pronoun in this passage to emphasize that Nick is responsible for the dog.
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