Soro

Soro was Helmeppo's pet wolf that had been released to frighten Shell Town's citizens. Soro attempted to attack Rika, but Roronoa Zoro saved her by killing him.
 * Not to be confused with Roronoa Zoro, the swordsman of the Straw Hat Pirates.

Helmeppo, angered that his pet had been killed, reported the incident to his father, forcing Zoro into confinement.