They can be. Tennis balls have an almost abrasive material covering them, and over time, this can cause damage to your dogs' teeth. Also, if your dog is strong enough to tear a tennis ball apart, he/she could choke on the pieces or swallow them, causing gastrointestinal problems.
Suggestion: Switch to racquetballs or vet-approved toys, and always monitor your dog when playing.
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Yes. Dogs mouths are too small for tennis balls but not. Dont get it mixed up. If they get it in there too tight, cut off air. Bad die. Not good.
Oprah dog died from a ball :((((