Ninken

Ninken are summoned ninja animals used by ninjas i.e. Pakkun, they are equals for the ninken are ninjas too

The Ninken (忍犬, The Ninken? literally "Ninja Dogs") are eight ninja dogs that Kakashi summons and has apparently raised from birth. All of the Ninken have a face-shaped design on their backs called a henohenomoheji (へのへのもへじ), which is the sound made when all the characters in the face are put together. The dogs themselves seem to resemble other characters in the series, with two closely resembling Naruto and Gaara. The Ninken are mostly used for tracking purposes. He can summon them individually or all at once.

Pakkun (パックン, Pakkun?), a pug and the smallest of the Ninken, is the most recurring of the group, being summoned numerous times to help in following and finding others. For the duration of Part I, Pakkun is the only dog shown capable of speaking. In Part II, the ability to speak is revealed to be common amongst almost all of the dogs. The dogs are also shown capable of walking on water.

The Ninken were added to the story because Masashi Kishimoto liked dogs and wanted them to be part of a number of different plot points. Pakkun's expanded role is due solely to the fact that Kishimoto thinks, "pug dogs are cute."[13]