Pedro is a curious little boy living in the heart of Mexico City. One day, he finds a lost puppy, scoops him up and takes him back home. He names the dog Black Tiger, and hopes the little puppy will turn out to be as brave as a tiger. In the same apartment block, live three other boys, Jose, Arturo and Alex, who, with their dogs, like nothing better than bullying Pedro and Black Tiger. When a powerful earthquake shakes the city, many are injured and Jose is nowhere to be found. Can Pedro find it in himself to overcome his hurt feelings and help save Jose?