Busting Myths About Bites

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There are a number of myths about dogs classified as "pitbull-type" dogs including myths about the strength and severity of their bites. These myths claim that they have "locking jaws", the "strongest" bite, and that they are more prone to "snap" (or bite without warning) than other dogs. Not only are these myths entirely false, but they are also scientifically baseless. Below, we summarize the facts and the peer-reviewed studies that fully debunk these myths that unfortunately lead to unfounded fear, ineffective public safety policies such as BSL (breed-specific legislation), and lower adoption rates in shelters for the many dogs that can get arbitrarily classified as "pitbull-type" dogs.

Locking jaws:

• No dogs (of any breed or type) have physical characteristics in their jaw that would cause or allow them to "lock" their jaws. Furthermore, pitbull-type dogs do not have a unique or morphologically different jaw structure from other dogs.
  Source: Dr. I. Lehr Brisbin, University of Georgia

Bite strength:

• The average bite strength of pitbull-type dogs has been measured to be 235psi - 26% lower than the average bite strength of all dogs (320psi) and fully in-line with other dogs of similar sizes and strengths. For example, the bite strength of German Shepherds was measured to be 238psi and the bite strength of Rottweilers was measured at 328psi - both higher than pitbull-type dogs.
  Source: ​Reference.com
• Several peer-reviewed studies have concluded that the strength of a dog's bite is related to a dog's overall size and strength - and not to its breed.
  Sources: (1)Frontiers in Veterinary Science, (2)Journal of Anatomy

Bite severity and injury (risk):

• A recent peer-reviewed study that analyzed 140 serious dog bite-related incidents concluded that there is no difference (in the medical treatment required following a bite or in the type of bite inflicted) between dog bites by breeds perceived as "dangerous" (legislated breeds such as "pitbull-type" breeds) and breeds that are not perceived as "dangerous" (non-legislated breeds).
  Source: Irish Veterinary Journal
• After analyzing a number of scientific sources including numerous peer-reviewed studies, the American Veterinary Medical Association (AVMA) concluded: "Controlled studies have not identified this breed group (pitbull-type dogs) as disproportionately dangerous."
  Source: American Veterinary Medial Association

Biting without warning (aggression/snapping):

• A peer-reviewed study conducted by the CDC that analyzed 20 years of dog bite-related fatalities (DBRFs) identified over 25 different breeds associated with DBRFs and the majority (72%) of incidents were attributed to breeds other than pitbull-type breeds - clear evidence that all breeds can unfortunately have unstable individuals that can bite without warning causing serious incidents and/or DBRFs - no breeds are immune from this.
  Source: CDC and the American Veterinary Medical Association
• A peer-reviewed study that analyzed canine aggression in different breeds concluded: "Comparing the results of non-legislated breeds and breeds affected by the legislation (such as pitbull-type dogs), no significant difference (in aggression) was found. A scientific basis for breed specific lists does not exist."
  Source: Journal of Veterinary Behavior

Disputed medical studies on the severity of dog bites:

• ​There is a selection of limited-scope medical studies commonly referenced by special-interest groups that support breed-specific legislation (BSL). These studies suggest (but do not substantiate with valid scientific methods or evidence) that bites by "pitbull-type" dogs are more severe than bites by other dogs. To investigate the data and claims made in these studies, a recent peer-reviewed study titled "Defaming Rover: Error-Based Latent Rhetoric in the Medical Literature on Dog Bites" conducted an in-depth qualitative review of these disputed studies and concluded that they contain rhetoric and misinformation including: "clear-cut factual errors, misinterpretations, omissions, emotionally loaded language, and exaggerations based on misunderstood or inaccurate statistics." In other words, these studies are scientifically unsound sources for breed-risk information (as they contain errors and invalid methods) and some were found to include cherry-picked data to support unscientific conclusions.
  Source: Journal of Applied Animal Welfare Science

Characterization of bites by "pitbull-type" dogs:

• The term "pit bull" is not a breed but instead an informal term used to describe a "type" of dog based only on its physical appearance (not on genetics or lineage) that can include the physical characteristics found in over 20 unique breeds and in even more mixed breeds. Therefore, attempting to attribute any kind of bite characteristic to a dog "type" is already a flawed and problematic proposition (even for a myth) due to the number of different breeds and mixes that can be classified as "pitbull-type" dogs. ​

Scientific studies and canine experts have fully debunked the myth that bites by "pitbull-type" dogs are somehow "different" or "more severe" than bites by other dogs of similar sizes and strengths. This is of course not comparing the bites of pitbull-type dogs to the bites of smaller breeds such as Chihuahuas or Dachshunds - but instead, to the bites of other strong breed dogs such as Dogo-Argentinos, Cane-Corsos, Bullmastiffs, Rottweilers, Doberman Pinschers, German Shepherds, and too many other strong breeds to list. Can bites by pitbull-type dogs cause injuries? Of course they can, but so can the bites of many other strong breed dogs - bites by pitbull-type dogs are not more severe or different in any way. The fact is that the bite severity of any dog is related to its overall size, strength, and energy - and not to its breed.​

Updated: May 15, 2019