"Charlotte's Web" is one of my favorite children's books. It is about a young girl who saves a pig from being killed because it is a runt. She raises the pig and has to send it away to live on her Uncle's farm because their is no longer room for him. The pig befriends a spider who saves him from being killed for meat by spinning messages in her web. I would use this in a fourth or fifth grade classroom to teach compassion for others and that friendship can be found in the most unexpected places.