He serves as a soldier in 'fierce dogs brigade'.

Short movie from 1934 about Norakuro from the Fierce Dog Brigade who is now promoted to Corporal and chases a mountain monkey that has stolen a confidential document.

Norakuro keeps getting his allies and enemies mixed up while on training maneuvers. What he had thought to be a successfully eliminated enemy tank turns out to be the tank carrying the Regimental Commander. 
(Source: AniDB)

The Company and Regimental Commanders engage in an idle chit-chat, blithely ignorant of the troops forging ahead under the previous "Forward March" command. Norakuro and his fellow recruits march gamely forward, regardless of the obstacles that may lie in their way. However, a horse stable looms up ahead. 
(Source: AniDB)

Norakuro's adventures in the Fierce Dog Brigade continue in this short film from the 1930s.

October, 1987, Autumn. In Suganami, Tokyo, there lives the Kinoshita family whereby the father draws very little pay out of his job as an ordinary salaryman. In order to cover expenses, he decides to let out the second floor of their apartment to earn additional rental income. One day, an obstinate-looking eldery dog, accompanied by a younger boy-dog, came knocking on their doors. The eldery dog addresses himself as Norayama Kuroyoshi and introduces his grandson as Norakuro. The former wants to open a detective agency and intends to rent the unit for their office. He will be the president of the investigative bureau while Norakuro-kun will be the director. He will also recruit one of the Kinoshita's sons, Keita-kun, as his employee and their advisor will be the girl-next-door, a high school student by the name of Rika Sawaguchi. On the third day since the official opening of the office, the telephone rang, a signal of a new case.
 
(Source: Anime News Network)

Norakuro (&#12398;&#12425;&#12367;&#12429;) is a Japanese manga series created by Suihou Tagawa. The titular protagonist, Norakuro, or Norakuro-kun, is a black and white dog. The name Norakuro is an abbreviation of norainu (&#37326;&#33391;&#29356;, stray dog) and Kurokichi (&#40658;&#21513;, the name of the dog, literally meaning "black lucky"). 
(Source: Wikipedia)

Norakuro is a black dog enlisted in the "Mokenrentai" (Fierce Dog Brigade), an Imperial army of dogs fighting in a war against the enemy Monkey Army.
 
Norakuro is a stray black-and-white dog in an army of white dogs who blundered his way while being a Private Second-Class.
 
This series was relatively faithful to the comics. One big change, however, was the addition of the army nurse Miko, whom Norakuro had a crush on. For this series, Norakuro was voiced by Nobuyo Ooyama, who would later become noted for voicing Doraemon.
 
(Source: Cartoon Research)

Nobuyo Ooyama, born Nobuyo Yamashita (山下羨代) was a Japanese retired actress, voice actress, singer, screenwriter, essayist, and TV personality affiliated with Actors Seven. Her husband is late TV personality Keisuke Sagawa. She is best known for voicing the title character in the Doraemon anime series that ran from 1979 to 2005, for 26 years. She also voiced Monokuma, the main villain from the Danganronpa video-game series, from 2010 to 2016 for the first three video games, two Danganronpa stageshows, and Danganronpa: The Animation.