To break the dog food into small pieces， then put then into the ball so that the food can easily fall out of the gap in ball.

To show your dog this action.

Once your baby pet know that when the ball rolling the food will fall from the ball， he will be stimulated the interest of exercises.

It can not only help pets lose weight to be more healthy， but also make your pets more lively.

Please allow 1-2cm difference due to different manual measurement.