The Brothers Lionheart, and the way it affects people's lives. Several Swedish hospitals have the book read, or the movie shown, to children who are gravely ill or dying. It's shown to have a remarkable effect on these children, relieving their fear of death a lot (often entirely). Probably because the book is about death, and what happens after, and therefore doesn't shy away from the topic.
A chapter of The Children of Noisy Village describes how Olaf rescued his dog from his abusive owner, the town shoemaker named Mr. Kind. It ends by saying the dog comes to meet Olaf after school but never goes as far as Mr. Kind's house because "Perhaps he's afraid that Mr. Kind will come out and take him back."