Answer:
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Explanation:
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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.
a slight amount or degree of difference; "a tad too expensive"; "not a tad of difference"; "the new model is a shade better than the old one" tad small indefinite amount
I hope this is correct and helps