Kuromaru

is the canine companion of Tsume Inuzuka. Kuromaru has a wolfish appearance and is missing his left ear and right eye. He appears to have the ability to talk. As his name suggests, his fur is black. Like Akamaru, Kuromaru has also grown in size over the timeskip, to the point where he is easily far larger than his human partner.

Invasion of Konoha
He first appears running along with Hana and Tsume to drive off some Oto and Suna shinobi on a rooftop.

Invasion of Pain Arc
He is later seen attacking Pain's Preta Path with Tsume, Kiba, and Akamaru.