What lesson does Enzo learn about loyalty throughout the story?

Throughout "The Art of Racing in the Rain," Enzo, the dog, observes and experiences the nature of loyalty in various relationships, particularly between his owner, Denny, and the people in their lives. The theme of true loyalty showcases the unwavering bond that Enzo has with Denny, despite the challenges they face. Enzo embodies a faithful companion who stands by Denny through thick and thin, demonstrating that true loyalty isn't conditional and persists even when circumstances grow difficult.

This lesson is reinforced as Enzo witnesses Denny's struggles, including the loss of his job, the fights for custody of his daughter, and the challenging dynamics with Denny's in-laws. Throughout all of this, Enzo remains steadfast, highlighting that real loyalty isn't broken by hardship or adversity. Rather, it endures and becomes a source of strength and support, underlining the significance of loyalty as an essential trait in the face of life's trials.