What are the motifs in Chucaro: Wild Pony of the Pampa by Francis Kalnay?

Dreams are a recurring idea in the book. In the book, Chúcaro is depicted as having a kind of magical quality. He appears out of nowhere, young and healthy. He has no history and immediately forms a bond with Pedro. He comes to occupy a pretty substantial portion of Pedro's attention and energy. Pedro builds so much of his life around Chúcaro that he becomes willing to sacrifice for Chúcaro to an unusual degree.