Well - developed characters, not just the dog but also the humans in the story. In 'Red Dog', the characters in the mining community are all unique and add depth to the story of Red Dog. Their interactions with the dog are what make the story so engaging.
Authenticity is key. It should accurately represent the real events and the relationship between the dog and the people involved. For example, in 'Hachi: A Dog's Tale', the bond between the dog and its owner feels very real.