This "Border Collie" of our's should be a "Retriever". She found an old, empty milk carton that is now her favorite toy. It is so much fun to watch her toss it in the air, then go running for it, it bounces, she reaches and grabs, then throws it back in the air. It is left out by this field so she can find it when we go back there. We really enjoy watching her have so much fun (us too!)