Buddy's story
(Book)

"Buddy is a dog with a big appetite and an even bigger heart--which means he's absolutely perfect for doing a Very Important Job. When Buddy becomes Noah's service dog, he is excited to have a family of his own. Noah has anemia, and he needs his canine companion to keep an eye on him. It's a big responsibility, but to Buddy, it's the best job in the world. One day on a trip to the beach, Noah gets sick and desperately needs Buddy's help. Can Buddy overcome slippery rocks, a dark cave, and strong ocean waves to rescue his friend?" -- Amazon.