How does meeting brog change Brock's life in the story the last dog by Katherine Paterson?

Meeting Brog changes Brock's life in "The Last Dog" by Katherine Paterson because Brog is a robot dog who helps Brock navigate and survive in a post-apocalyptic world. Brog becomes Brock's loyal companion, offering him comfort, protection, and a sense of purpose as they journey together. Through their relationship, Brock learns to trust again and finds hope for the future.