No scientifically reliable ranking of dog breeds by bite force has been established. The strongest evidence measures individual dogs under different conditions, bite locations and instruments—not a standardized contest between breeds. One 1995 pilot study recorded 13 to 1,394 newtons (N) in 22 pet dogs, while a 2008 study found very different ranges at the canine teeth and second molar. Those results cannot be turned into a single, defensible breed leaderboard.
Popular claims such as “the Kangal bites at 743 PSI” should therefore be treated as unverified, not as established veterinary data. Here is what the measurements actually show, why PSI lists are misleading and how to judge a new claim.
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Why there is no dependable list of the strongest-biting breeds
A breed ranking would require researchers to test enough dogs from multiple named breeds with the same device, at the same tooth position, under comparable conditions, and report the sample and method. The peer-reviewed studies located do not do that. They examine small groups of domestic or pet dogs, combine or compare measurement techniques, or discuss how skull shape affects calculations.
That distinction matters because “bite force” is not one fixed trait that produces the same number every time. A reading changes with the tooth used, the dog’s willingness to bite, the situation, the measuring device and the way the force is calculated. A number from one dog at a molar cannot be ranked directly against a number from another dog at a canine tooth.
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The available evidence supports a careful conclusion: individual dogs can produce a wide range of forces, but the studies located do not establish which breed has the highest typical, maximum or average bite force.
What the main studies actually measured
| Study | Sample and conditions | Reported result | What it does—and does not—show |
|---|---|---|---|
| Lindner and colleagues, 1995 | 101 readings from 22 pet dogs weighing 7–55 kg | 13–1,394 N; mean 256 N; median 163 N | Shows variation among individual dogs. It was not a comparison of named breeds. |
| Ellis and colleagues, 2008 | 20 domestic dogs; in-vivo readings during muscle stimulation under general anesthesia | 147–946 N at the canine teeth; 524–3,417 N at the second molar | Shows that tooth position produces different values. It is not a breed leaderboard. |
| Frontiers in Veterinary Science review, 2018 | Review of direct and calculated measurement methods | Reports substantial variation within and among species | Explains why skull shape, animal behavior, situation and technique complicate comparisons. |
The 1995 pet-dog measurements
Lindner and colleagues collected 101 readings from 22 pet dogs weighing between 7 and 55 kilograms. Forces ranged from 13 to 1,394 N. The mean was 256 N and the median was 163 N. The gap between the low and high readings is the important finding: dogs in a small mixed sample did not produce one predictable value.
The study did not provide the controlled, balanced sampling needed to say that one breed bites harder than another. Weight, individual anatomy, motivation and the particular reading all contribute to the spread. Treating the maximum reading as a breed characteristic would be a statistical and biological overreach.
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The 2008 canine-versus-molar study
Ellis and colleagues studied 20 domestic dogs and recorded forces in vivo while the animals’ jaw muscles were stimulated under general anesthesia. At the canine teeth, observed forces ranged from 147 to 946 N. At the second molar, they ranged from 524 to 3,417 N.
Those are not competing estimates of one universal “dog bite.” They are measurements at different locations in the mouth. Molars sit closer to the jaw joint and have different leverage from the front canine teeth, so a molar reading can be much higher. A list that places a canine reading beside a molar reading without identifying the tooth position is not making a like-for-like comparison.
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The same study tested skull-based lever models used to calculate force. The models substantially underestimated the observed mean forces. The authors cautioned that their improved calibration might not generalize beyond their sample and urged care when extrapolating to other dogs. A calculated value is therefore not automatically equivalent to a direct reading.
What the 2018 veterinary review adds
A 2018 review in Frontiers in Veterinary Science describes several ways researchers estimate or measure bite force and emphasizes substantial variation among and within species. In dogs, differences in skull shape make calculations especially difficult. Direct readings can also change according to the animal’s volition, the situation and the specific technique.
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“Direct in vivo measurement of a bite in dogs has been done; however, bite forces were highly variable due to animal volition, situation, or specific measurement technique.”
Frontiers in Veterinary Science review, 2018
Why PSI breed charts are usually not scientific rankings
PSI means pounds per square inch, a pressure. A force reading in newtons tells you how hard the jaw pushes; a PSI value also depends on the area over which that force is applied. To compare the two, you would need the force, the exact contact area and a clearly described measurement setup. The studies above report force in newtons and do not supply a standardized cross-breed PSI table.
A frequently repeated claim says that a Kangal produces 743 PSI. The traceable item behind that figure is a 2019 university student design notebook, not a peer-reviewed breed-comparison study. No primary study located validates the number or uses it to support a ranking against other breeds. It should not be presented as a settled measurement.
The same scrutiny applies to any chart that assigns an exact PSI number to a named breed. Before accepting it, look for all of the following:
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- The number of dogs tested in each breed and their relevant size or age information.
- The tooth position and whether the reading was taken voluntarily, under anesthesia or by another protocol.
- The instrument, calibration procedure and contact area used to obtain the value.
- Clear units and a method for converting or reporting pressure, if PSI is used.
- Statistical results showing averages and variation, not just a single maximum.
If those details are missing, the number may be an illustration, an estimate or an internet repetition, but it is not evidence of a scientific breed order.
How bite force is measured—and why methods disagree
Direct in-vivo measurement
A direct method records force while a dog bites a sensor or force transducer. The setup has to balance safety, calibration and the dog’s willingness to participate. A cooperative voluntary bite may be weaker than a motivated bite, while a dog that refuses the device produces no useful reading. The sensor’s size and placement can also alter where the teeth contact it.
Measurements under controlled muscle stimulation
The 2008 study used muscle stimulation under general anesthesia, allowing researchers to activate jaw muscles in a controlled way. That design reduces the effect of voluntary behavior, but it is not the same situation as an awake dog choosing to bite. Its canine and second-molar results demonstrate why the tooth location must accompany every number.
Skull-based estimates
Researchers can use skull dimensions, muscle anatomy and lever models to estimate force without placing a sensor in the mouth. This is useful when direct testing is impractical, but the estimate depends on assumptions about muscle size, jaw geometry and mechanical leverage. In the 2008 comparison, skull-based models substantially underestimated observed mean forces, and the authors warned that their calibration might not apply broadly.
Because each method answers a slightly different question, two numbers can both be accurately reported and still be incomparable. “Measured directly,” “calculated from a skull” and “estimated from a model” should never be treated as interchangeable labels.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What makes one dog’s reading higher than another’s?
Tooth position and leverage
Front canines and rear molars sit at different distances from the jaw joint. The 2008 ranges—147–946 N at the canines versus 524–3,417 N at the second molar—show the practical effect. A claim that omits location leaves out a major part of the measurement.
Skull and jaw anatomy
Head shape changes the length of the jaw lever and the way muscles act on it. Even within a breed, dogs are not identical. Sex, age, body size, skull proportions and individual muscle development can all contribute to variation. A breed label cannot replace those measurements.
Motivation and circumstances
The 2018 review notes that an animal’s volition and situation affect direct readings. A calm pet in a laboratory, an anesthetized dog receiving muscle stimulation and an animal responding to a stressful event are different experimental circumstances. Their values should not be merged as though they represented one standardized behavior.
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Sensor stiffness, shape, calibration and placement influence what the instrument records. The bite may be concentrated on one tooth or spread across several contacts. Unless two studies use the same protocol, a numerical difference may reflect equipment or technique rather than a biological difference between dogs.
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Bite force is not the same as danger, aggression or temperament
A stronger force reading does not by itself predict whether a dog will bite, how often it will bite or how severe an injury will be. Aggression and temperament are behavioral questions; injury risk also depends on the location of contact, duration, movement, tissue vulnerability and whether the bite breaks skin. The measurement studies discussed here do not investigate those outcomes.
For owners and professionals, management should therefore focus on the individual dog’s behavior, training, supervision, environment and history—not on an internet ranking that assigns a PSI number to its breed.
How to evaluate a “strongest bite” claim
- Identify the original source. A reposted chart is not evidence. Find the paper, report or technical document that first states the number.
- Check whether it is peer reviewed. A student project, blog or unsourced infographic may contain an interesting estimate, but it does not establish a clinical or breed-wide fact.
- Read the sample description. Confirm how many dogs were tested, which breeds they represented and whether the result is an average, range or single maximum.
- Match the measurement location. Canine, premolar and molar forces are different quantities. Do not compare them in one list.
- Match the method and conditions. Direct voluntary readings, anesthetized muscle stimulation and skull-based calculations measure different things.
- Check the units and uncertainty. Newtons, pounds-force and PSI are not interchangeable without the relevant area and conversion method. Look for variation, confidence intervals or other uncertainty information.
- Ask whether the conclusion exceeds the evidence. A small sample can describe those dogs; it cannot automatically rank every dog of a breed.
What a scientifically honest answer sounds like
If someone asks, “Which dog breed has the strongest bite?” the defensible response is: Current peer-reviewed measurements do not establish a reliable breed-by-breed ranking. Individual dogs have produced widely varying forces, and values change with tooth position and measurement method.
If the question is, “How strong is a dog’s bite in PSI?” explain that the strongest studies located report force in newtons, not a standardized PSI leaderboard. A PSI claim needs a documented contact area, protocol and traceable comparative study before it can be treated as a scientific result.
That answer is less dramatic than a numbered list, but it is more useful: it tells readers what has actually been measured, what cannot be compared and which details are required before a precise breed claim deserves confidence.
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