Never give your cat or kitten thread or string to play with as it could cause serious internal injuries if swallowed. (windsorhumane.org)
Besides being hard, pets often get serious internal injuries and severe gastrointestinal troubles when swallowing sharp, difficult to digest bones. (goodnewsforpets.com)
As a pedestrian, you are more likely to suffer from serious internal injuries. (getinjuryanswers.com)