Pochi

Pochi is the dog that Inari owned, you only see him once during a flashback in the Land of Waves arc. Even though dogs are usually able to swim right away, when Pochi was stolen by bullies and thrown into a lake he started to drown. This was the first time you see Inari act like a coward. Even if his dog was drowning he couldn't find the courage to jump in and save him. Inari thought of Pochi as his only friend.

Pochi later remembered he knew how to dog paddle and walked off, having no loyalty to Inari.