Chouchou

Shushu (シュシュ) is a white dog from Orange Town who guards a pet shop, day and night, unmoving, because the shop belonged to his deceased owner, Hocker.

Appearance
Shushu is a simple small white dog with short ears, thin white fur, and beady black eyes.

Personality
Shushu is a very loyal dog, protecting his master's pet shop with his own life, and refusing to move from the spot despite the danger. He also assisted the Straw Hat Pirates in escaping from the townspeople who misunderstood their intentions, as being grateful for helping him.

Past
When Hocker left one day for the doctor, he entrusted his pet shop to Shushu. Hocker eventually died of an unknown illness, and never returned. Deep down, Shushu knew his master died, but refused to move from the shop, adamant in protecting it. The shop became the dog's treasure. Even when the Buggy Pirates attacked the town and the rest of the townspeople fled to a refuge on the outskirts, Shushu continuously refused to budge. Mayor Boodle would come from time-to-time to feed Shushu, as well as try to convince him to go to the refuge.

Buggy Arc
When first meeting Luffy, Shushu swallowed the key to the cage Luffy was in at the time to which he was half-strangled by Luffy trying to get the key back. Then Mohji and Richie appeared to search for Luffy, Zoro, and Nami. When Richie spotted the pet shop they headed for it to get a quick snack. Shushu fought against Richie to defend the shop, but got beaten. In the end, he could only watch his master's pet shop burn to the ground. Luffy, out of his cage thanks to Richie, saw how sad the dog was for the loss of his only treasure, and defeated Mohji and Richie as payback for Shushu. After the battle, Luffy presented Shushu with a bag of dog food, the last one from his master's shop. Shushu then leaves the town and heads to the refuge set up by the townspeople. Shushu later helps the trio escape from the angry townspeople after Luffy reveals that he was the one who knocked out the mayor, as well as a pirate. Shushu is last spotted biting Mohji on his rear end while the townspeople chase out the remnant of the Buggy Pirates.

News of the Straw Hats' Return
Shushu is seen having a grand opening of his giant pet food shop.

Trivia

 * Shushu's unwavering faithfulness to his master is based on the concept of a faithful dog remaining loyal to their master despite their master's death. This concept is commonly seen in various multimedia and was made famous by the devotion of real life dogs like Hachikō and Greyfriars Bobby.