Safe use has not been evaluated in cats and dogs with gastrointestinal obstruction, or those that have ingested toxins. (zoetisus.com)
Believe it or not, the material in tennis balls can cause the teeth to wear down and pieces can lead to choking or gastrointestinal obstruction if ingested. (thesprucepets.com)
However, repeated vomiting and diarrhea can rapidly lead to life - threatening dehydration; they also can be symptoms of major problems such as gastrointestinal obstruction. (petsmagazine.com.sg)