Best Toys for Heavy Chewers: Safety and Selection

Introduction

Canine oral behaviour, particularly chewing, serves multiple physiological and psychological functions. Puppies chew to alleviate teething discomfort, adult dogs chew to maintain dental hygiene, and many dogs chew as a form of environmental exploration or stress relief. However, a subset of dogs, termed "heavy chewers" or "power chewers", exhibit an intense, persistent drive to gnaw, shred, and consume objects. This behaviour, when directed at inappropriate items such as furniture, shoes, or electrical cords, poses significant risks to both the dog and the household. More critically, even toys marketed as "indestructible" can fail catastrophically, leading to gastrointestinal obstructions, dental fractures, or toxic ingestion.

This pillar article provides a comprehensive, evidence-based framework for veterinarians, veterinary nurses, and dedicated pet owners to select and evaluate toys for heavy chewers. We integrate principles from veterinary dentistry, behaviour medicine, and material science, referencing guidelines from the American Veterinary Medical Association (AVMA), the American Animal Hospital Association (AAHA), the Canadian Veterinary Medical Association (CVMA), and the Federation of Veterinarians of Europe (FVE). We also address regional variations in toy availability and safety standards across North America, Europe, and Australia.

Quick Q&A

Question: What is the safest type of toy for a heavy chewer? Answer: The safest toys are those made from a single, non-toxic material that cannot be easily shredded or swallowed. Rubber toys with a high Shore durometer (hardness) rating, such as those from reputable brands like Kong or Goughnuts, are generally preferred. Always supervise initial play and discard any toy showing signs of wear, such as cracks or missing pieces.

Understanding the Heavy Chewer: A Clinical Perspective

Defining "Heavy Chewer"

From a veterinary behaviour standpoint, a "heavy chewer" is not merely a dog that enjoys a good chew. It is a dog that applies sufficient bite force to deform, fracture, or ingest materials that would be considered durable for the average canine. The American Veterinary Medical Association (AVMA) notes that chewing intensity varies by breed, individual temperament, and underlying medical conditions. Breeds with strong jaw musculature and a history of working tasks (e.g., Labrador Retrievers, German Shepherds, Pit Bull Terriers, Rottweilers, and Australian Cattle Dogs) are disproportionately represented among heavy chewers.

The Bite Force Factor

Bite force is measured in Newtons (N) or pounds per square inch (PSI). A study by Ellis et al. (2008) in the Journal of Anatomy estimated that domestic dogs can generate bite forces ranging from 117 PSI (small breeds) to over 450 PSI (large working breeds). For comparison, a typical nylon bone may withstand 200-300 PSI, while a high-density rubber toy may resist up to 500 PSI. Understanding this biomechanical reality is crucial for toy selection. A toy that is "tough" for a 10 kg Cocker Spaniel may be a choking hazard for a 40 kg Labrador.

Medical and Behavioural Differential Diagnoses

Before recommending specific toys, it is essential to rule out underlying issues that may exacerbate chewing behaviour. According to the Merck Veterinary Manual, excessive chewing can be a sign of:

• Dental pain: Periodontal disease, fractured teeth, or oral masses.
• Gastrointestinal discomfort: Pica (eating non-food items) can be associated with inflammatory bowel disease or exocrine pancreatic insufficiency.
• Nutritional deficiencies: Rare, but possible in dogs fed unbalanced homemade diets.
• Anxiety disorders: Separation anxiety, noise phobias, or generalised anxiety can manifest as destructive chewing.
• Cognitive dysfunction syndrome (CDS): In geriatric dogs, CDS can lead to inappropriate chewing behaviours.

The CVMA emphasises that a thorough veterinary examination, including oral health assessment and behavioural history, should precede any toy recommendation for a heavy chewer.

Toy Material Science: What Works and What Fails

Rubber and Thermoplastic Elastomers (TPE)

High-density natural rubber (e.g., Kong Classic) and thermoplastic elastomers (e.g., Goughnuts, West Paw Zogoflex) are the gold standard for heavy chewers. These materials offer:

• High tensile strength: Resists tearing and puncturing.
• Energy dissipation: The material "gives" slightly under bite force, reducing the risk of dental fracture.
• Non-toxicity: Reputable brands use food-grade, BPA-free, and phthalate-free compounds.

However, not all rubber toys are equal. The Shore durometer (a measure of hardness) should be above 70A for heavy chewers. Softer rubbers (below 50A) can be shredded and ingested.

Clinical note: The AVMA cautions that even the toughest rubber toys have a finite lifespan. Owners should inspect toys weekly for surface cracks, nicks, or changes in texture. A toy that has been chewed to the point of exposing internal air pockets or fillers should be discarded immediately.

Nylon and Polyurethane

Hard nylon bones (e.g., Nylabone Dura Chew) are popular for heavy chewers. These materials are extremely hard (Shore D 70-80) and resistant to shredding. However, they pose two significant risks:

1. Dental fractures: The hardness of nylon can exceed the fracture toughness of enamel, leading to slab fractures of the premolars or carnassial teeth. A study by the American Veterinary Dental College (AVDC) notes that hard nylon toys are a common cause of tooth fractures in dogs.
2. Sharp edges: Once a nylon toy is abraded, it can develop razor-sharp edges that lacerate the gingiva, tongue, or palate.

Recommendation: Nylon toys should only be used under direct supervision and should be replaced at the first sign of splintering.

Natural Chews: Rawhide, Bones, and Antlers

Natural chews are often perceived as "healthy" alternatives, but they carry significant risks.

• Rawhide: The CVMA and the Canadian Food Inspection Agency (CFIA) have issued advisories regarding rawhide. Rawhide is not digestible and can swell in the stomach, causing foreign body obstruction. Additionally, rawhide is often treated with bleach, formaldehyde, or artificial flavouring agents.
• Cooked bones: The AVMA strongly advises against cooked bones (especially poultry bones). They become brittle and splinter, causing oesophageal or intestinal perforation.
• Antlers and hooves: These are extremely hard (Shore D >80) and pose a high risk of dental fractures. The European Food Safety Authority (EFSA) has flagged antlers as a choking hazard in a 2020 opinion on pet food safety.

Regional note: In Australia, the Australian Veterinary Association (AVA) and the Department of Agriculture, Fisheries and Forestry (DAFF) have specific guidelines regarding the importation and sale of natural chews due to biosecurity risks (e.g., foot-and-mouth disease in imported bones).

Rope Toys and Fabric Toys

Rope toys are not suitable for heavy chewers. The fibres can be pulled apart and ingested, leading to linear foreign bodies. A linear foreign body is a surgical emergency that often requires enterotomy. The FVE has published clinical guidelines emphasising that rope toys should be restricted to supervised, gentle play only.

Plush and Squeaky Toys

Standard plush toys are contraindicated for heavy chewers. The stuffing, squeaker mechanisms, and plastic eyes/noses are easily ingested. Even "tough" plush toys with reinforced seams can be breached in minutes by a determined chewer.

Safety Assessment: A Veterinary Protocol

The "Tooth and Toy" Examination

Veterinarians should perform a structured assessment of any toy brought into the practice. The AAHA Canine Life Stage Guidelines recommend the following evaluation:

1. Visual inspection: Look for cracks, tears, missing pieces, or exposed fillers.
2. Palpation: Squeeze the toy. Does it return to its original shape? Are there hard or sharp internal components?
3. Bite test (in vitro): If safe to do so, apply moderate manual pressure. Does the toy deform or fracture?
4. Size assessment: The toy should be larger than the dog's mouth opening to prevent swallowing. A good rule of thumb: the toy should be at least 1.5 times the width of the dog's muzzle.
5. Material identification: Is the material homogeneous? Avoid toys with multiple layers, glued components, or metal inserts.

Choking and Obstruction Risk Stratification

The Cornell Feline Health Center (and by extension, canine emergency medicine) classifies foreign body risk into three tiers:

• Low risk: Single-piece, non-splintering rubber toys > 5 cm in diameter.
• Moderate risk: Hollow rubber toys with a single opening (e.g., Kong). These can trap the tongue or jaw if the dog's mouth swells.
• High risk: Any toy that can be shredded, splintered, or broken into pieces smaller than the dog's oesophagus.

Toxicological Considerations

The European Medicines Agency (EMA) and the U.S. Consumer Product Safety Commission (CPSC) regulate toy safety, but not all pet toys undergo rigorous testing. Common toxins to screen for include:

• Phthalates: Used as plasticisers in soft PVC toys.
• Bisphenol A (BPA): Found in some polycarbonate plastics.
• Lead and heavy metals: Present in some painted or dyed toys.
• Formaldehyde: Used in rawhide processing.

The AVMA recommends purchasing toys from manufacturers that provide material safety data sheets (MSDS) or third-party testing certifications (e.g., ASTM F963, EN 71).

Evidence-Based Toy Selection Guide

Top Recommendations for Heavy Chewers

Based on veterinary consensus and material science, the following toy types are considered safest for heavy chewers:

1. High-density rubber treat-dispensing toys:

   • Examples: Kong Extreme, West Paw Toppl, Goughnuts Black Ring.
   • Rationale: These toys combine durability with mental enrichment. Filling them with wet food, peanut butter (xylitol-free), or yogurt extends playtime and reduces anxiety.
   • Supervision: Required initially. Ensure the dog cannot bite off pieces larger than a pea.

2. Indestructible rubber rings:

   • Examples: Goughnuts Black Ring, Planet Dog Orbee-Tuff.
   • Rationale: These are designed with a "safety indicator" layer. When the dog chews through the outer layer, a contrasting colour is exposed, signalling that the toy should be replaced.

3. Hard, non-splintering nylon bones (with caution):

   • Examples: Nylabone Dura Chew (for large breeds).
   • Rationale: Suitable for short, supervised sessions. Must be discarded when any rough edges appear.

4. Natural rubber balls with no seams:

   • Examples: Chuckit! Ultra Ball, Jolly Pets Bounce-n-Play.
   • Rationale: Seamless construction reduces the risk of splitting. These are best for fetch, not sustained chewing.

Toys to Avoid

• Any toy with a squeaker: The squeaker is a choking hazard.
• Tennis balls: The felt covering is abrasive and can wear down enamel. The ball itself can be chewed apart.
• Ice cubes or frozen treats: While not toys, frozen water can fracture teeth.
• Compressed rawhide chips: Often sold as "dental chews," these are high-risk for obstruction.

Regional Considerations

• United States: The AVMA and AAHA provide the most comprehensive guidelines. Look for toys labelled "power chewer" or "extreme" from brands that participate in the Pet Industry Joint Advisory Council (PIJAC).
• Canada: The CVMA and CFIA regulate pet food and treats, but toys fall under the Canada Consumer Product Safety Act. Owners should verify that toys are BPA-free and phthalate-free.
• Europe: The FVE and the European Pet Food Industry Federation (FEDIAF) offer guidelines. Look for the CE mark, which indicates conformity with EU safety standards.
• Australia: The AVA and DAFF have strict biosecurity laws. Imported natural chews (e.g., pig ears, bully sticks) are subject to quarantine. Australian owners should prioritise locally manufactured rubber toys.

Behavioural Enrichment and Chewing Alternatives

The Role of Mental Stimulation

Chewing is often a symptom of boredom or anxiety. The AAHA Behaviour Management Guidelines recommend a multimodal approach:

• Puzzle feeders: Toys that require the dog to manipulate parts to release food (e.g., Nina Ottosson by Outward Hound).
• Scent work: Hiding treats in a snuffle mat or a cardboard box.
• Training sessions: Short, positive reinforcement sessions can redirect chewing energy.

When to Refer to a Veterinary Behaviourist

If a dog's chewing behaviour is compulsive (i.e., the dog cannot be redirected, or the behaviour occurs in the absence of toys), a referral to a board-certified veterinary behaviourist (DACVB or ACVB) is warranted. Underlying anxiety disorders may require pharmacotherapy (e.g., fluoxetine, clomipramine) in addition to environmental modification.

Conclusion

Selecting the best toys for heavy chewers requires a nuanced understanding of canine oral anatomy, material science, and individual behaviour. No toy is 100% indestructible, and all toys require regular inspection and eventual replacement. Veterinarians play a crucial role in educating owners about the risks of inappropriate toys, the signs of dental trauma, and the importance of supervised play. By following the evidence-based guidelines outlined in this article, and consulting regional authorities such as the AVMA, CVMA, AVA, or FVE, owners can significantly reduce the risk of toy-related injuries while still providing their heavy chewers with safe, enriching outlets for their natural chewing instincts.

References

1. Ellis, J. L., Thomason, J. J., & Biewener, A. A. (2008). Bite force and performance in the domestic dog. Journal of Anatomy, 213(3), 297-307.
2. American Veterinary Medical Association (AVMA). (2023). Pet Safety: Choosing the Right Toy. Schaumburg, IL: AVMA.
3. American Animal Hospital Association (AAHA). (2021). AAHA Canine Life Stage Guidelines. Lakewood, CO: AAHA Press.
4. Canadian Veterinary Medical Association (CVMA). (2022). Position Statement on Rawhide Chews. Ottawa, ON: CVMA.
5. Canadian Food Inspection Agency (CFIA). (2021). Pet Food Safety: Rawhide and Chews. Government of Canada.
6. Federation of Veterinarians of Europe (FVE). (2020). FVE Guidelines on Pet Toy Safety. Brussels, Belgium: FVE.
7. European Food Safety Authority (EFSA). (2020). Scientific Opinion on the Safety of Pet Chews. EFSA Journal, 18(4), 6078.
8. Merck Veterinary Manual. (2023). Behavioural Problems in Dogs: Destructive Chewing. Kenilworth, NJ: Merck & Co.
9. American Veterinary Dental College (AVDC). (2022). Tooth Fractures in Dogs: Prevention and Treatment. AVDC Position Statement.
10. Australian Veterinary Association (AVA). (2023). Pet Toy Safety: A Guide for Veterinarians. St Leonards, NSW: AVA.
11. Department of Agriculture, Fisheries and Forestry (DAFF). (2022). Biosecurity Import Conditions for Pet Chews. Australian Government.
12. Cornell Feline Health Center. (2021). Foreign Body Ingestion in Dogs. Ithaca, NY: Cornell University College of Veterinary Medicine.
13. European Medicines Agency (EMA). (2019). Guidelines on the Safety of Materials in Contact with Pets. London, UK: EMA.
14. American Animal Hospital Association (AAHA). (2022). AAHA Behaviour Management Guidelines. Lakewood, CO: AAHA Press.