Ninken

are any dogs that have a chakra supply, and thus are able to work with ninja. Some, such as Pakkun and Kuromaru, can talk. Although the dogs belonging to the members of the Inuzuka clan are ninken, the phrase is usually used in reference to the pack of eight ninken summoned by Kakashi Hatake. Kakashi's ninken have shown the ability to walk on water.

Kakashi's ninken
(see: kakashi's Ninken)

Inuzuka ninken

 * Akamaru
 * Kuromaru
 * The Haimaru Sankyodai

Others

 * Giant Multi-Headed Dog (summoned by Pain's Animal Path)