The article below is based on non-localized content only available in Japanese.
Nagito Komaeda's dog is a minor character who is mentioned in Danganronpa 2: Goodbye Despair and Super Danganronpa 2 - Komaeda Nagito no Koūn to Kibō to Zetsubō.
He was a pet dog who was owned by Nagito Komaeda and his wealthy parents during Nagito's childhood, until he was run over by a truck and killed.
Nagito's dog was a large dog with a long, thick pale coat, floppy ears and a bushy tail. He had dark-colored, bright eyes and a kind expression. He sometimes wore a dark-colored, possibly black collar.
Nagito's dog appeared to be a happy and kind dog, who didn't mind the company of children as he enjoyed hugs from young Nagito.
Prior to the Tragedy
Nagito's dog was owned by the wealthy Komaeda family and he was very close with young Nagito, who was the only child in the family.
Due to Nagito's bad luck, the dog was hit by a truck and killed. This is the earliest known occurrence of Nagito's cycle of good and bad luck and it left him deeply saddened and possibly traumatized.
Danganronpa 2: Goodbye Despair
Chapter 5 - Smile at Hope in the Name of Despair
After Nagito threatened to blow up Jabberwock Island with explosives, Akane Owari loses her temper and attempts to strangle him to death. Nagito is close to death and appears to have a vision of his dead dog. Chiaki Nanami rescued Nagito and he simply gets up, laughs and thanks Akane for giving him a chance to see his dog again after such a long time.
Young Nagito was very close with his dog and he often hugged him affectionately. He was deeply saddened and possibly traumatized by the dog's sudden death.