One Piece Chapter 13, page 17: Chapter 13: TREASURE

Luffy sits cross-legged in front of Chouchou, saying, 'THAT'S ALL I COULD SAVE FOR YOU, BOY! THE REST GOT EATEN, OR BURNED...' Nami gasps in realization, thinking, 'HE FOUGHT THAT LION......FOR THE DOG'S SAKE!!' Luffy smiles and tells Chouchou, 'YOU DID GOOD! YOU FOUGHT WELL! I DIDN'T GET TO SEE YOU IN ACTION... BUT I KNOW YOU DID GOOD!' Chouchou picks up the box of pet food in his mouth and walks away.