Doggy Dental Hygiene: Dental Treats
"Treats such as hard plastic bones, sterilized real bones, ice cubes, cow hooves, antlers, bully sticks are too hard for your pet and may cause tooth fractures. Dental treats that have received the Registered Seal by the Veterinary Oral Health Council (VOHC) are recommended.
The VOHC is an organization that exists to recognize products that meet preset standards of plaque and tartar/calculus retardation in dogs and cats. VOHC is an excellent resource for dental diets, treats, water additives, gels, toothpastes, and tooth coatings, that help retard plaque and tartar on the teeth of animals."