She can be purchased by the player character for a small sum of caps, usually around 250. She can then be sent to any settlement and will give defense points to that settlement, and she will fight any attackers.
She provides 8 points of defense to the settlement she is sent to, which is more than the dogs gotten from Wasteland Workshop. However, unlike other dogs, she does not increase settlement happiness.
In Russian, the word Mishka (Мишка) is used to refer to a bear - medved (Медведь), mostly meaning the friendly one or even a toy, as well as a nickname of the name Michael - Mikhail (Михаил). For example: Teddy bear - plyushevyy mishka (плюшевый мишка).