If you have a dog or a cat, you may be tempted to do something about their teeth or bad breath.  I would have never thought of this, but I ran across this page that cautions against giving them to your pet.

The article explains how one owner had to take their dog to the vet as a Greenie got stuck in the dog’s intestines and required emergency surgery.

I’m not sure how old the article is, but I think it is serious enough to at least ask your Vet or contact the Greenies company and ask them.  They may have updated their recipe by now and perhaps they are safer by now.