how has the protagonist has developed/changed? (what has she learned?) what were some changes and what those changes suggest about the meaning of the text?

The whole story is soaked with the narrator’s/author’s/protagonist’s love to the dog, and the dog’s endless allegiance to his closest creature – the man. John gets attached to Marley from the very moment when he saw him. No matter how many dirty tricks the dog did, John always loved him and treated him, as if he were a member of the family. Only in some time John realized why he had attached to Marley so fast – they were very similar. John even adored Marley in some way: the dog was much braver and vigorous than he himself.