The two main characters are the girl and the dog. There may be other minor characters like animals that come near the cabbin or people who the girl might interact with in relation to the cabbin, but the focus is on the girl and the dog.
Maybe the girl and the dog are living in the cabbin and they have a daily routine like going for walks in the woods near the cabbin. The dog protects the girl from any wild animals that might come around.
Obviously, the main characters are the girl and the dog. They are the central focus of the story and most of the events probably revolve around their relationship.
The main characters are the girl and the dog. The girl could be a brave and adventurous type. The dog could be a big, strong shepherd dog that accompanies the girl on her hikes in the mountains. They might also meet other hikers or animals during their adventures, but the focus remains on their relationship.
Well, clearly the dog and the girl are the main characters. The dog might be a heroic character with special abilities.
Obviously, the girl and her guard dog are the main characters.
Obviously, the boy and the dog are the main characters.
It depends on the specific 'the black dog story'. It could be a child and the black dog.
Obviously, the main characters are the man and the dog.
Obviously, the ghost dog is one of the main characters. There might also be the people who encounter the ghost dog, like the local residents in the area where the dog haunts.
The main character is most likely the dog itself. It's the one that's going through the transformation, so it's at the center of the story.