Two-Headed Black Dog

Summary
The Two-Headed Black Dog is an animal-like monster that strongly resembles a Rottweiler dog from Naofumi's world. Similar to the Cerberus, but wields only two heads instead of the Cerberus's three heads.

The Two-Head Black Dog is one of the monsters that appear out of the several rifts in the sky during the First Wave and attacked Raphtalia's Village. After the destruction of the village, the Two-Headed Black Dog along with several other monsters from the wave inhabited the old coal mines near Riyute Village.

The villagers in Riyute abandoned the coal mines due to them being full of dangerous monsters from the First Wave. The Two-Headed Black Dog was later killed by Raphtalia when it attacked Naofumi.

Debut

 * Anime: Season 1, Episode 2
 * Manga: Volume 1, Chapter 4
 * Light Novel: Volume 1, Chapter 16
 * Web Novel: Never Shown

Trivia

 * The Two-Headed Black Dog reminds Raphatalia of the Cerberus that killed her parents.
 * Raphtalia overcame her past trauma after killing the Two-Headed Black Dog.