Final answer:
The correct punctuated sentence is 'I just saw my aunt's new puppy, Spot; he is so cute and cuddly!'
Step-by-step explanation:
The sentence that is punctuated correctly is: I just saw my aunt's new puppy, Spot; he is so cute and cuddly!
This sentence uses correct punctuation by placing a comma after 'puppy' and a semicolon after 'Spot' to separate the two main clauses. Additionally, each sentence starts with a capital letter and ends with an appropriate punctuation mark, which is important for proper punctuation.
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