"I will give you what you want for the dog," said Mr. Alden. "The children love him. They want to keep him."
"But I sold him to a lady," said the man. "I must take the dog to her." (13.26-13.27)
Even the "extras"—aka the super minor characters—in the book have a moral code. That's some commitment Warner shows to morality, don't you think?