A common question is: is that "plastic" harmless? No, it absolutely is. It's not just any plastic. Dinobone/Nylabone is made of chemically resistant plastic. It doesn't bond with the body in any way, it can't cause blockages, the material doesn't stick to the stomach or intestines, and it can't splinter. The plastic fibers/pieces that come off pass through the gastrointestinal tract just like dietary fiber. It's also ideal for dogs with allergies.