Igor is one of the Russian Army dogs working under the platoon leader Maxim.
Ginga Densetsu Weed
When Viktor and Bozlev betrayed Maxim and took over the whole army, Igor and Iwanov stayed loyal to Maxim. Maxim sent them back to Russia to report their marshal about the betrayal. However, they didn't get far, as they were soon caught and killed by Bozlev's soldiers.
See more in Igor/Gallery