SmartBones, PetMatrix says, are rawhide-free chew treats made with chicken and vegetables. SmartBones come in chicken and peanut butter flavors, along with a dental variety for oral health. The chews are available in four sizes: Mini, for dogs weighing 5-10 pounds; Small, for dogs weighing 11-25 pounds; Medium, for dogs weighing 26-50 pounds; and Large, for dogs over 50 pounds.