~ We always have two out at a time, however she does not have a much interest in the ball as she does chasing Jake around. She does play with it, however not like Jake.
~ We buy several and always have back ups. When one gets beat up and starts to split or crack, it gets thrown away and replace with a new one. Not worth any piece of red rubber getting torn off and swallowed by a dog or tortoise. We never use tennis balls because of all the bacteria that is harbors because of the material it is made of.