I took the "digestable" greenies away from mine after reading this a while ago. I just didnt want to take the chance and wasnt sure if I would be able to monitor each piece that he chewed off, so I found the new greenies, made by the same exact company. They are the non-edible kind and they are called "Smart Greenies." They sell them at Pet Supermarket and you can get them from
www.petedge.com also.
At first my guy wasnt too impressed, but now he LOVES it! My little girl has no interest. She is perfectly content with Nylabones in every shape size and flavor!