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If you're using them to actually play tennis, they don't work nearly as well after a couple uses.

They're not even great for dogs: https://www.akc.org/expert-advice/health/are-tennis-balls-sa...

We use balls that are made for togs and wound t be suitable for a game of tennis. However, after 1 use he isn’t interested in the ball anymore and insists on a new ball next time.

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