If you're looking for manga similar to Shiroi Senshi Yamato, you might like these titles.
Riki is the son of Shiro, the strongest bearhound in Ohu. He was born the runt of his litter, the only red pup and much smaller than his siblings. Feeling sorry for him, his mother Yamabuki's owner decides to keep him, naming him Riki - a "big, strong" name. When Yamabuki's original owner asks for her dog back, Riki is unhappy with the forced seperation from his mother and runs away from home. He is rescued by Shiro, who encourages him to become stronger and stand up for himself. Moved by Shiro's words and his display of power, Riki returns to his owners, striving to get stronger. Over time he grows rapidly in size, becoming stronger and more powerful than ever, and Shiro proudly acknowledges Riki as his son.
Story of Akame's family origins dating back to the days when the conflict between Iga and Kouga started.
Tadashi’s father found a treasure map but before he could bring it home was assassinated by a secret society called The Good Night. He entrusts the map to a dog and her pups to get it to Tadashi, so that he can travel the Silk Road and find the treasure. Good thing the dogs have powers of their own…
The dogs have been at peace, and all has seemingly gone well. However soon the monsterous bear Monsoon attacks, wanting to claim Futago Pass as his own while getting vegeance for his father Akakabuto, who was killed by Gin. Victory is not assured for the dogs, as an aging Gin has started to go blind and the Supreme Commander Weed is fatally injured by one of Monsoon's kin. Can the soldiers of Ohu defeat this new take on an old threat, or is this truly to be their last fight?
Fang is a hybrid of a white wolf and a German Shepherd. Together with his human master, he seeks to find out who attacked and killed Fang's mother.
It is said that deep in the mountains of Ohu, in a place called Futago Pass, there exists a paradise for dogs. Fourteen years ago, the legendary Gin led many warriors against the evil bear Akakabuto and won; now, in the present, Gin's secret son, Weed, has just learned the news of his father's identity. Alongside companions such as the English Setter GB, young and lovable Mel and his late mother's friend, Uncle Smith, Weed sets forth to find his father; and along the way, he meets new friends and defeats powerful enemies alike!
Silver, from the moment he was born, was destined to be a hunting dog. Named for the silver stripe on his body, his fate is sealed when his father is killed by the ferocious bear Akakabuto -- to be the one who kills Akakabuto. From that moment on, he vows to grow up, to become a strong enough dog, to slay the bear who stole his father's life.
Zero is a wild dog who is saved by a boy named Taro after making enemies with hunters. Their carefree days of living on the streets are interrupted when Zero undertakes a journey to sharpen his fangs.