The Gallytrot looks a lot like a Black Dog. According to Karenn, the Gallytrot is a genetic mutation of the Black dog and is therefore particularly unstable.
Nevra's companion is a female Gallytrot named Shaitan, meaning "demon" in Arabic.
Possible reference to Demon, Castiel's dog in My Candy Love.
The name Black Gallytrot comes from the English word "Gallytrot" (kind of strange dog with demonic and zombic appearance).
During episode 14, if you are in the Shadow Guard, Nevra will give you the assessment along with Shaïtan. This is also where we discover this new companion (it is possible to choose with whom you pass the evaluation during a replay).
