Dogs love playing with the ball most of all. But the ball tends to wander about and get lost. So tetherball is a great option for dogs.
Katrina Griswold had 7 corgis who were fond of playing with a ball. The dogs would run enthusiastically after the ball but as soon as they saw the tetherball they lost their control. They played with their new tetherball with great pleasure and could now freely throw them where they wanted. The ball would never get lost.