The statement that is true for sentence that have more than one clause is that, there can be one negative word per clause. If a sentence has more than two clauses, then each clause can have one negative word. But double negatives in one clause is grammatically wrong.
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I would say something very off topic like talking about the eating patterns of dogs or something super random like that, ha! But there are no answers provided so that's all I can say right now!
Hope I could help!
It's an adjective; "The smallest puppy" is the subject of the sentence as the rest of the sentence describes it. Of course the subject cannot just be "puppy" so it must include "The smallest" as well. Since smallest is an adjective (A word that describes something else,) that answer is Adjective.