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  jmdt, don't worry about being a buzzkill - I thought about that potential problem too!  I tested the "mouth" of the tennis ball on my finger, and it really doesn't clamp tightly at all, especially on something as small as a puppy tongue.  Try it out for yourself and make your own decision, but I don't worry about Nikko with a popped tennis ball any more than I do with any other toy.  
 Lauren & Nikko
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