Home Alone Entertainer - For the dog that destroys anything - the washing, the plants, barking, separation anxiety or just wants to have fun!
For the dog that requires a food stimulus to make it play place a small amout of food in the ball, making a fuss so the dog can see what you're doing. In the dog's attempt to to reach the food by pulling the grip food will fall around the dog and it will release it's grip to get the food. The assembly will spring back above it's head.
For the really aggressive player, and for dogs 45 Kg or more, Bull Mastiff, German Shepherd, Rottweiler and Great Danes or heavy framed medium dogs including Bull Terriers, American Pit Bull Terriers, large Labradors, Golden Retrievers and Ridgebacks.
Also note if there are teeth marks in the ball then it needs to be raised higher.