Jolly Teaser Two-In-One Ball Blue 10"Jolly Teaser Two In One Ball Blue 10" Your dog is going to spend countless hours trying to get the ball out of the ball. No need to worry though, the inside ball isn't going anywhere. And to make it more interesting, you can put some peanut butter on the inside ball to drive them even crazier! Chase sure to give your dog a run for his money Swim ideal for water based fun Entertain Ball within a ball amuses during solo play