Three Haimaru Brothers

The are the triplet canines from Konohagakure's Inuzuka clan and the companions of Hana Inuzuka.

Appearance
Being triplets, all three dogs have the same grey fur with white undersides and short pointed ears. They have also seemingly grown larger since their last appearance.

Invasion of Konoha Arc
The three canines were first seen during Orochimaru's invasion of Konoha. Alongside Tsume Inuzuka, Kuromaru, and Hana, they aided in the fight against the invading Sand and Sound shinobi.

Sasuke Retrieval Arc
They appeared in Kiba's flashback along with Hana, Kuromaru and Tsume Inuzuka when Kiba first meets Akamaru when they were children and promises that he'll take good care of him. They were seen later in Kiba's hospital room while Hana treats Akamaru's wounds.

They also make an appearance alongside Hana in the anime-only filler episode Kiba's Long Day, in Part I.

Invasion of Pain Arc
In the anime one of the triplets was seen alongside Hana and the other Konoha shinobi by celebrating Naruto's victory over Pain after the invasion was over.

Shinobi World War Arc
One of the triplets was seen alongside Hana when members of the Fifth Division were sent as backup after the enemy were detected. He and Hana use the Fang Rotating Fang technique to destroy the white Zetsu.

Trivia

 * The 'Hai' in the name Haimaru means 'ash' or the colour 'grey' (as their name suggests, their fur is grey), and 'maru' meaning 'perfection' or 'full circle' is a common suffix for Japanese male names.