What type of canine training does Enzo undergo in the story?

Enzo's training throughout the story primarily consists of informal observation and learning from Denny, who is a race car driver. This method of training is unique because Enzo, as a dog, learns not only about the intricacies of racing but also about life, relationships, and the challenges that Denny faces. His experiences lead him to develop a deep understanding of human behavior and the philosophy of endurance and resilience, which ties back to both Denny's character and the racing metaphor that permeates the narrative.

This informal approach to training allows Enzo to evolve as a character, as he connects the behaviors and teachings he observes with his own experiences and instincts. Unlike formal training at a dog school or involvement in specific obedience and agility competitions, Enzo's journey is enriched through the relationships he forms and the observations he makes, giving him a unique perspective that goes beyond traditional dog training.