Title: Short lifespan
Product review: I don't find these balls "tough" at all. I purchased 20 packs when they were on sale for $1 as expendable balls for ground chase and river fetch at the local dog park. Instead of losing them, they're being expended by falling apart. In less than two weeks, my dog (not huge - a 45 lb. year-old lab mix) has split four of them during routine play. Penn tennis balls seem to withstand a lot more play. At the price paid, its tolerable, but I'm giving one star because I'd be really unhappy if I had paid full price.
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