What is the main conflict in Chucaro: Wild Pony of the Pampa by Francis Kalnay?

Chúcaro: Wild Pony of the Pampa is the story of a young Argentinian boy, Pedro, and a beautiful pink horse he discovered named Chúcaro. The story takes place in the Argentinian Pampa, the prairie between the Andes and the Atlantic Ocean. Most of the main characters are gauchos, basically cowboys and ranchers. They all heard and maintain livestock on an estancia, an enormous farm owned by a patrón or estanciero named Señor Muñez. Pedro's familial situation is somewhat unusual. His father, called "The Vaquero", is nearing old age and is often drunk. He has left Pedro in the care of a tall, lanky, courageous but solitary gaucho named Juan. Juan and Pedro get along well and Juan protects Pedro during difficult times.