is one piece episode 6 filler?

Having warded off the Buggy Pirates, a wounded Zoro drags Luffy's cage to a local pet food shop. The mayor appears and takes Zoro into his house to nurse his wounds.

Meanwhile, Luffy interacts with Chouchou, a dog defending the shop. The mayor explains that Chouchou's owner passed away from illness, so he continues to defend the deceased owner's store as a memento.

Although Nami arrives with the key to Luffy's cage, Chouchou eats the key before the cage could be unlocked. Buggy sends his first mate, Mohji the Beast Tamer, to search for and eliminate Zoro.