KONGCoreStrength™ Ball - Long Lasting Dog Dental and Chew Toy - For Medium Dogs

On 2/19 we bought core strength bone for our 7lb yorkie. he has already chewed through a piece. anticipated it would last much longer. can we return?

what is the size of the ball?

Can peanut butter go in the dent of ball ?

How well does this bounce compared to the classic Kong balls or a tennis ball?