I second Marilyn's comment. Tennis balls are not good for dogs' teeth because they wear them down over time. I only learned this recently and have switched to non-abrasive felt which is much gentler on dogs' teeth. You can check them out on Chewy https://www.chewy.com/frisco-fetch-squeaky-tennis-ball-dog/dp/179581. Or as Marilyn suggested, LAX balls are a good alternative.
Deb
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