The author's purpose for writing out the attributes of a dog is to remind the readers that dogs have remained man's best friend.
The author's purpose for writing any piece of work is the reason for or intent in writing.
Some authors intend to provide:
According to King Frederick of Prussia, “The only, absolute, and best friend that a man has, in this selfish world, the only one that will not betray or deny him, is his DOG.”
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