My new puppy is just as energetic as a tornado! However, my old cat is not nearly as loud as the dog when demanding breakfast.

For positive statements, we must use as...as (we generally only use "so...as" in negative sentences).

For the second blank, the linking verb "is" requires an adjective (loud), not an adverb (loudly). As always, we keep the adjective in its base form, avoiding comparatives like louder.