I have been buying the hartz chew n clean bones for my oldest dog for about two years. I work at a vet clinic and I am aware that Hartz is is a brand not to be trusted, but I thought the bones would be okay. I have never had any problems with them up until about a week ago. My younger dog has been chewing on the bones as well. He was having surgery to repair a fractured leg and when surgery was over he began bleeding out of his rectum, a lot. The doctor was suspecting internal bleeding because of the amount of blood. While my dog was passing the blood they found a small orange piece of plastic that was very sharp. The doctor came to the conclusion that the bleeding was caused by Colitis. Later on when my dog was being cleaned up a green piece of plastic was found, also very sharp. The only things in my house that are orange and green like those pieces of plastic are the hartz bones. I threw them away immediately. I cannot believe they are allowed to sell toys and bones for dogs that can cause so much damage. Thank god my dog is recovered now and has no more problems. I will only buy name brand toys from now on.