The Dog

The unnamed dog is a character the player can discover through completing True Companion, and lurks around the house looking for food before being discovered by the player. After that, it may appear in various other events throughout the game.

Personality
The dog does not interact much with the Doctor, other than accepting food from them and lingering around the house often enough for them to notice. But after completing the required Research the dog is shown to be very protective of the Doctor, and by extension of Kein. They will attack other people who are deemed a threat to their safety.

Appearance
The dog is not described as anything more than a regular dog, however it can be assumed that it is fairly large as it can scare off individuals who wish to harm the Doctor and Kein. Much like with the Doctor, the dog's specific breed is left up to interpretation so the player can imagine whatever breed they desire.

Trivia

 * The Events Doctor is Attacked and House Robbed can be avoided with minimal negative impacts if the player has gotten the dog within their run, as it will defend the Doctor/house and prevent the event from happening