Quick answer: Yes. Hard chews including yak milk chews, deer antlers, and certain nylon chews regularly cause slab fractures and broken teeth in dogs. Vets call these "tooth fracture chews," and they see the results constantly. The safest way to avoid a broken tooth is a simple field test called the kneecap rule: if you can't dent the chew with your fingernail, or it would hurt to tap it against your knee, it's hard enough to fracture a tooth. Fangz collagen chews pass this test because they're made from beef collagen that softens with saliva. Hours of chewing, zero fracture risk.
Yes. A dog chew absolutely can break a tooth. It happens more often than most owners realise, and it costs more than most owners expect.
Veterinary dentists have a shorthand for the problem: "tooth fracture chews." The list of culprits is consistent. Deer antlers, yak milk chews, cow hooves, cooked bones, and certain hard nylon products show up repeatedly in case notes. In each case, the physics are the same. The chew is harder than tooth enamel. The dog applies force. The tooth loses.
The good news is that avoiding a broken tooth is not complicated. One field test covers almost every chew on the market.
The Kneecap Rule: How to Test Any Chew Before You Give It
This is the single most useful thing in this article. Share it, print it, remember it.
If you can't make a dent in the chew with your fingernail, it's too hard.
A second version of the same test: tap the chew firmly against your kneecap. If it hurts, it can fracture your dog's tooth.
Veterinary dentists use variations of this guideline to help owners sort safe chews from dangerous ones. The logic is straightforward. Dog tooth enamel is harder than human enamel, but it still has a breaking point. Any chew that can't be dented by a human fingernail is approaching or exceeding the hardness that fractures a carnassial (the big shearing tooth at the back of the mouth, and the most common fracture site).
Run this test on any chew before you buy. It takes three seconds and it can save you a $2,000 vet bill.
Which Chews Actually Break Teeth?
Deer antlers
Antlers are dense, calcified bone material. They do not soften with saliva. They do not compress under pressure. They are, in terms of hardness, one of the worst things you can give a power chewer. Veterinary dental authorities including the AVDC and Cornell University College of Veterinary Medicine identify antlers and similar antler-type products as among the most common items associated with tooth fractures. The kneecap test fails immediately: you would not want to tap a fresh antler against your kneecap.
For a full breakdown, see our article on whether antlers are safe for dogs.
Yak milk chews
Himalayan-style yak chews are pressure-cooked and dried to an extremely high density. The production process creates a product that does not soften with saliva in any meaningful way, at least not in the early stages of chewing when the dog is exerting maximum force. This is the window when fractures happen.
The kneecap test: a fresh yak chew is not something you would want to tap against your knee. Fingernail dent: impossible.
We cover the full picture in our deep-dive on whether yak chews are safe for dogs.
Cooked bones
Cooked bones are dangerous for two reasons: they splinter, and they're brittle in a way that transfers force suddenly. A raw bone has some give; a cooked one does not. Cooked bones are not a chew recommendation from any mainstream veterinary body.
Cow hooves
Hard, dense, hollow, and they can shatter. The hollow structure means a power chewer can concentrate force on a small surface area. Combined with rock-like hardness, this makes them a common fracture risk.
Hard nylon chews (certain types)
Some hard nylon products are marketed as "indestructible" chews. Indestructible means harder than teeth. The marketing feature is the exact problem. Check any hard nylon chew against the kneecap rule. If it doesn't dent under fingernail pressure, it shouldn't go in your dog's mouth unsupervised.
For more on this category, see our article on Nylabone alternatives for power chewers.
How Serious Is a Broken Tooth?
More serious than it looks. Dogs don't show pain the way humans do. A fractured tooth might be obvious from the outside (a visible crack or missing chunk), or it might be a small slab fracture that you'd only notice if you were looking carefully.
What happens after a fracture:
- The pulp chamber (the soft core of the tooth) is often exposed in a slab fracture. This is painful and allows bacteria in.
- Exposed pulp leads to infection. Left untreated, that infection can spread to the jaw, the sinus, and in serious cases systemically.
- Treatment is either tooth extraction or root canal therapy. Both require general anaesthesia. Both cost hundreds to thousands of dollars. Major fractures at specialist veterinary dentists can run approximately $2,000 to $4,000 (this is an estimate; costs vary by clinic and location).
The carnassial tooth (upper fourth premolar) is the most common fracture site because it's the tooth dogs use most forcefully when working on a hard chew. It's also one of the harder teeth to treat. A carnassial root canal or extraction is a significant procedure.
None of this happens with a chew that softens under saliva.
Comparison: How Common Chews Stack Up on Tooth Safety
| Chew type | Passes kneecap test? | Softens with saliva? | Tooth fracture risk | Approximate duration |
|---|---|---|---|---|
| Fangz collagen chews | Yes | Yes, gradually | Low | Hours per session; one chew lasts days to weeks |
| Yak milk chews | No | Minimally (outer layer only) | High | Hours (but dangerous) |
| Deer antlers | No | No | High | Very long (but dangerous) |
| Bully sticks | Yes | Yes | Low | 20-60 minutes |
| Cooked bones | Fails (brittle) | No | Very high | Avoid |
| Cow hooves | No | No | High | Long (but dangerous) |
| Hard nylon (rigid type) | No | No | High | Does not degrade |
| Rawhide | Borderline | Yes, but unevenly | Low-moderate | 15-45 minutes |
Duration is approximate and varies by dog size, breed, and chewing intensity.
What Makes Fangz Different: the Softening Mechanism
Fangz collagen chews are slowly air-dried over 2 to 4 weeks. That process creates genuine density. A large Fangz will occupy a determined chewer for hours per session, and a single chew often lasts days to weeks depending on how hard your dog goes at it. Hours, not minutes, is the floor.
But the density is not the same as hardness. Beef collagen is a protein that responds to moisture. When your dog chews, saliva begins to break down the surface layer. The chew softens as it's worked. That means at every stage of the chew session, the surface your dog is biting into is yielding to pressure, not resisting it.
The kneecap test: a Fangz chew will show a fingernail dent. You would not mind tapping it against your knee.
That's the difference between a chew that gives your dog hours of engagement and a chew that puts them on an operating table. If you want to build a Fangz pack with the right size for your dog, the Build Your Pack page walks you through it.
Fangz are 3 ingredients: beef collagen, beef gelatine, and one superfood powder (pumpkin, beetroot, spirulina, or goat's milk). No preservatives, no additives. About 93% protein and about 1% fat (Goat's Milk runs about 82% protein and 2% fat). No sugar. No fillers. Puppy-safe from 4 months old.
For a full breakdown of what's in the chew, see our 3-ingredient label explainer.
Are Any Chews 100% Safe?
No chew is zero risk for every dog. The right answer depends on your dog's age, size, jaw strength, and chewing style.
Some dogs are gulp-swallowers. They break off a piece and try to swallow it whole. For those dogs, any chew carries a choking or blockage risk. Supervision matters more than the chew type.
The kneecap rule eliminates the most common risk: hard-chew fractures. It doesn't eliminate all risk. Supervise your dog, especially with a new chew. Remove any piece that's small enough to be swallowed whole. If in doubt, soak the end in warm water for five minutes to soften it before giving it to a heavy chewer or an older dog.
Where Fangz isn't the answer:
- Dogs that gulp-swallow: any chew can be a blockage risk; match the size carefully and supervise.
- Dogs on a strict novel-protein elimination diet for allergy testing: check whether beef collagen suits your protocol.
- Owners looking for the cheapest option: Fangz is not a $2 chew. A $2 chew that lasts 10 minutes costs more per hour of engagement than something that lasts hours per session and days to weeks as a whole chew. But if upfront cost is the constraint, that's fair.
The 10% Rule Still Applies
Even a safe chew is still a treat. The standard veterinary guideline is that treats, including chews, should make up no more than 10% of your dog's daily calorie intake. Fangz is about 93% protein and virtually fat-free, so this is an easy rule to stay inside. But size your chew to your dog (Small for under 8kg, Medium for 8 to 15kg, Large for over 15kg) and factor it into their daily intake. The Fangz Build Your Pack page makes it easy to choose the right size and flavour.
For a detailed walkthrough, see our article on how many chews a day is safe.
What to Do If Your Dog Has Already Fractured a Tooth
See a vet, promptly. Don't wait to see if it "heals" or if your dog "seems fine." Dogs mask pain extremely well. A fractured tooth with exposed pulp does not heal on its own; it progresses to infection.
Signs of a fractured tooth can include: reluctance to chew on one side, dropping food, blood on the chew or in the water bowl, facial swelling, or pawing at the mouth. Often there are no obvious signs at all, which is why dental checks at annual vet visits matter.
After treatment: switch to chews that pass the kneecap rule. Your dog's remaining teeth are worth protecting.
The One Test Worth Remembering
Tap it against your knee. Try to dent it with your fingernail.
That's the whole thing. Two seconds of testing before you buy, every time. It doesn't matter how good the marketing looks, how long the chew claims to last, or how many owners say their dog loves it. If it fails the kneecap rule, it's a fracture risk.
The chews that pass this test and still last hours per session (and days to weeks as a whole chew) are the ones worth buying.
Try a Fangz chew: 3 ingredients, made in Brisbane, softens with saliva. Ships Australia-wide. Refund if your dog doesn't love it.
Sources
- Veterinary Oral Health Council (VOHC): vohc.org. Seal of acceptance criteria and accepted products for dogs.
- Veterinary dental guidance from the AVDC (avdc.org), Cornell University College of Veterinary Medicine (vet.cornell.edu), and VCA Animal Hospitals consistently identifies antlers, bones, hooves, and other hard objects as common causes of tooth fractures in dogs.
- Flint HE, Atkinson M, Lush J, Hunt ABG, King T (2023). "Long-Lasting Chews Elicit Positive Emotional States in Dogs during Short Periods of Social Isolation." Animals (MDPI), 13(4):552. PMC9951671. (Chewing-behaviour and emotional-state study.)
- American Veterinary Dental College (AVDC): avdc.org. "Tooth Fractures" patient education resource.
- Cornell University College of Veterinary Medicine: "Broken Teeth in Dogs" (vetmed.cornell.edu). Covers fracture types, treatment options, and prevention.
- Veterinary dental professionals routinely cite the "kneecap rule" (also phrased as the "rule of thumb" or "fingernail test") as a quick field guide for chew hardness. Source: multiple DVSc/DAVDC-authored patient education materials.