Tonton

is Tsunade's pet pig, often kept in the care of Shizune. She does not speak in any human language, but still manages to get her point across by whining in her own unique tone (a "buhi" or "oink" depending on the language). It seems that Tsunade and Shizune are able to understand what Tonton is trying to say. Tonton's nose also seems adept at tracking things, such so that Pakkun has some familiarity with her.

Abilities
Although not meant for combat, Tonton has shown herself to be a partner to Shizune in some of her jutsu, similar to Kiba and Akamaru. In the anime, Tonton performed a Transformation Jutsu, appearing as Tsunade (although she did not speak). It could be that Shizune performed the jutsu on her.

Trivia

 * In the video games Naruto: Ultimate Ninja 2, Naruto: Ultimate Ninja Heroes 2: Phantom Fortress, Naruto: Ultimate Ninja 3 and Naruto Shippūden: Ultimate Ninja 4 Tonton is used by Shizune in "Hog Style: Tonton", which is a jutsu that throws Tonton at an opponent while spinning upward. In Naruto: Ultimate Ninja 4, Tonton is used as a partner to Shizune, helping her out in her Ultimate Jutsu by transforming into an image of Shizune and attacking the enemy to distract them from Shizune's main attack. In Shizune's "Great Cross Slash", Tonton butts the enemy in the stomach to knock the enemy back for Shizune's main attack.