Nin-dog

A Nin-dog is a dog bread to be a ninja's partner. One of such nin-dogs is Akamaru, partnered with Kiba Inuzuka. Similarly Kakashi has contracts with Nin-dogs like Pakkun, however Kakashi summons his nin-dogs with a summoning jutsu and has contracts with multiple of then rather than pairing with one nin-dog as his fighting style.

List of Nin-dogs
 * Pakkun
 * Akamaru
 * Kuromaru

Nin-dog Groups:
 * Haimaru Sankyodai
 * Ninken