My dog, Jack is 12 years old. We went to the vet just a month ago, and the one thing she really commented on, is how great his teeth are! He gets this treat every night at 8 pm. And he knows it! How he can tell time, I do not know. But he comes looking for me every night for his good boy treat. He loves these, and they are really great at keeping his teeth clean and gums healthy.