Both Smudge and Winter will chew away at a tennis ball if given the chance...more Smudge then Winter, Winter actually prefers to throw it in your lap when it's sopping wet, but she has been known to destroy them from time to time. That's why if I give them a ball to ball I make sure it's fairly hard to kill, in other words the rubber balls used for squash and racqet(sp? Haven't been awake long enough to think) balls. Only problem with those is that Winter gets them so wet that she can't hold on to them.