Which of the following sentences should NOT include commas?

Question

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My new pet, covering himself in mud, is a dog.
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My new pet, a dog, is in the mud.
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The dog, in the mud, is my new pet.
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My dog, who is in the mud, is having a lot of fun.
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Answer 1

The sentence that should NOT include commas is:

"My new pet is a dog."

When this sentence is revised for clarity without the apposition, it would read simply as “My new pet is a dog.” The other sentences correctly use commas to set off additional information.