Domovoi is kept by Baba Yaga as a guard dog.
Domovoi is kept starved and restrained with a chain as a guard dog for Baba Yaga, to keep her slaves in line while she is otherwise engaged.
It is not known what kind of Fae species he is.
A domovoi or domovoy is a house spirit in Slavic folklore. The actions performed by a domovoi vaguely resemble (but are not limited to) those of poltergeists and are not necessarily harmful. Traditionally, every house is said to have its domovoi. It does not do evil unless angered by a family’s poor keep of the household, profane language or neglect. The domovoi is seen as the home's guardian, and he sometimes helps with household chores and field work.
- 2.04 Mirror, Mirror