Greenies have occupied a unique position in the dog dental treat market since their US launch in 1996: they are the only mainstream dog dental chew to hold dual accreditation from the Veterinary Oral Health Council (VOHC) โ accredited for reducing both plaque and tartar. This distinction matters. The VOHC plaque seal is significantly harder to achieve than the tartar seal (it requires evidence of prevention at the earliest bacterial biofilm stage, before mineralisation has begun), and very few commercial treats meet that standard.
In the UK, Greenies are available through ZooPlus in the full size range โ from Teenie (for dogs 2โ7kg) through to Large โ as well as the SmartBites functional treat range for joint, hip, and immune support. We’ve reviewed the complete Greenies range for 2026, explaining the clinical science behind the dual VOHC seal and helping you choose the right size and format for your dog.
How Greenies Work: The Science Behind the Dual VOHC Seal
The Greenies dental chew achieves its dual accreditation through a combination of mechanical and chemical mechanisms:
- Texture engineering: Greenies are formulated to be softer than rawhide or nylon chews (reducing tooth fracture risk) but firm enough to require genuine sustained chewing โ the abrasive action disrupts plaque biofilm on the outer tooth surface and, critically, at the gumline where periodontal bacteria accumulate.
- Leaf shape: The distinctive elongated leaf shape maximises the area of each tooth that contacts the treat surface during chewing. The narrow tip reaches into the interdental spaces between the upper carnassial teeth โ the primary tartar accumulation site in dogs.
- Chlorophyll and natural breath fresheners: Greenies use wheat-derived ingredients as their base (note: not suitable for wheat-allergic dogs) which carry natural chlorophyll โ a documented breath deodoriser โ without synthetic flavouring agents.
- Digestibility: Unlike rawhide, Greenies are 100% digestible as verified in independent trials. If your dog swallows a large piece, it will pass safely โ a significant safety advantage over alternatives.
Which Greenies Size Does My Dog Need?
| Size | Dog Weight | Treat Weight | ZooPlus Price (340g) |
|---|---|---|---|
| Teenie | 2โ7 kg | ~14g each | ยฃ14.39 |
| Petite | 7โ11 kg | ~22g each | ~ยฃ14.39 |
| Regular | 11โ22 kg | ~34g each | ~ยฃ14.69 |
| Medium | 12โ22 kg | ~57g each | ยฃ14.69 |
| Large | 22โ45 kg | ~88g each | ยฃ8.79 |
How Greenies Compare to Pedigree Dentastix
Both Greenies and Dentastix are VOHC-accredited โ but for different standards. Dentastix holds the VOHC seal for tartar reduction only. Greenies holds the VOHC seal for both plaque AND tartar reduction, meaning Greenies has evidence of effectiveness at an earlier stage of the dental disease process.
The practical difference: if your dog’s teeth are already relatively clean and you are feeding dental treats preventatively, either brand works well. If your dog’s teeth already show visible yellowing (early tartar) and you want the maximum clinical impact of a daily treat without veterinary descaling, Greenies’ evidenced plaque action represents a meaningful advantage.
Greenies are also more palatable for the majority of dogs โ the wheat-based formula and natural green colour make them a higher-value treat than Dentastix for most dogs, which is important because daily compliance is the determining factor in dental treat effectiveness.
View Greenies at ZooPlus โGreenies SmartBites: The Functional Treat Range
Greenies SmartBites are a separate product โ soft, small training treats containing targeted functional ingredients rather than the dental-focused formula of the standard chews. Available varieties include:
- Hip & Joint SmartBites: Contains glucosamine and chondroitin at dosages shown to support cartilage health in dogs with mild to moderate joint disease. Useful as a daily supplement delivery vehicle for dogs who resist direct supplement addition to their food.
- Skin & Fur SmartBites: Omega-3 and omega-6 in a concentrated per-treat dose for dogs with dry coats or persistent shedding.
- Immune SmartBites: Vitamin C, E, and beta-glucan (from yeast cell walls) for immune system support โ particularly useful during high-stress periods such as kenneling, shows, or illness recovery.
Important Caveat: Greenies Contain Wheat
Greenies use wheat as a primary ingredient in their binding matrix. If your dog has a diagnosed or suspected wheat allergy/intolerance, or if you are currently running an elimination diet trial (wheat-free is a prerequisite of most elimination protocols), do not use Greenies.
For wheat-free dental treat alternatives, see our Best Dog Dental Treats guide which covers Whimzees (potato starch, grain-free) and Purina Dentalife as alternatives.
Frequently Asked Questions
How often should my dog have a Greenies chew?
Daily, for maximum benefit. Greenies is one of the few dental treats for which the clinical trial data specifically reflects daily use. One chew per day is both the safe and the most effective protocol.
Can puppies have Greenies?
Greenies Puppy treats are available in Teenie and Petite sizes, formulated with a softer texture specifically for developing teeth. Standard adult Greenies should not be given to puppies under 6 months. Puppies should have Puppy Greenies from the age the adult teeth begin to emerge (approximately 4โ6 months depending on breed).
My dog swallowed the Greenies whole โ is this dangerous?
Unlike rawhide, Greenies are independently verified as fully digestible and will break down safely in the digestive tract. However, swallowing whole defeats the purpose (no chewing = no mechanical plaque removal) and represents a choking risk in large pieces. If your dog gulps treats rather than chewing, supervise actively and consider switching to a harder format that forces more oral work before the treat can be swallowed.
For broader dental care beyond treats, see our complete Best Dog Dental Treats UK guide. For general treat guidance including training treats and natural chews see Best Dog Treats UK.