The Legend of Zelda: Link's Awakening/Secret Seashells

Seashell 1
Slash the bushes out of the way to find your first Secret Seashell.
 * Item needed: Sword

Seashell 2
Dig in Bow-Wow's kennel for a second Secret Seashell.
 * Item needed: Shovel

Seashell 3
Blow your way into room n-# of Tail Cave to find a third Secret Seashell.
 * Item needed: Bombs