Thanks for the insight all! I did end up buying some Kong Mini Squeakers... they were just too hard to resist. Heck, they seemed fun to ME
I don't plan on giving them to little Rylie until we check with the vet about the teeth thing. Good to know that we can just throw them out when they start to get fuzzy though. I thought they would be okay since they aren't as fuzzy as regular tennis balls, but I'll ask the vet to make sure!