How do you get surprise symphony on Nintendogs?

To unlock "Surprise Symphony" in Nintendogs, you need to achieve a high friendship level with your dog and participate in competitions. As you progress, your dog will learn new tricks and skills, which can help improve your bond. Additionally, ensure that you regularly care for your dog, play with it, and keep it happy. Once your dog's friendship level is sufficient, you may receive the Surprise Symphony as a reward.