Pit bull-type dogs are involved in more reported bite injuries than any other breed in the United States. They appear at the top of nearly every dataset tracking emergency room visits, fatal attacks, and pediatric injuries. But the full picture is more complicated than a single breed label suggests, and the numbers come with significant caveats about how dogs are identified after a bite occurs.
Breeds Most Often Linked to Serious Injuries
A 20-year analysis published in the Journal of the American Veterinary Medical Association tracked every documented fatal dog attack in the U.S. from 1979 through 1998. Pit bull-type dogs were involved in 76 deaths, followed by Rottweilers at 44, German Shepherds at 27, husky-type dogs at 21, and Malamutes at 15. More than 25 breeds appeared in the data, but pit bulls and Rottweilers together accounted for over half of all fatalities.
The pattern holds in more recent injury data as well. Pit bulls and Rottweilers combined have been linked to roughly 76% of all fatal dog attacks in broader analyses. Pit bull-type dogs alone are associated with about 60% of all reported bite injuries and 63% of eye injuries caused by dogs.
Other breeds that consistently appear in bite reports include German Shepherds, Labrador Retrievers, Bulldogs, Chow Chows, Jack Russell Terriers, and Dobermans. The list shifts depending on whether you’re measuring frequency of bites (how often a breed bites) or severity (how much damage results). Chihuahuas, Dachshunds, and Cocker Spaniels bite frequently but rarely cause injuries that require hospitalization.
Children Face the Highest Risk of Severe Bites
Children under five are more likely than any other age group to need surgery after a dog bite, largely because of their small size and the fact that bites often land on the face and neck. A systematic review of pediatric dog bite studies in the U.S. found that pit bull-type dogs were the most commonly identified breed across multiple hospital datasets. In one study of over 1,600 pediatric bites, pit bulls accounted for 38.5% of cases where breed was recorded, followed by mixed breeds at 13% and Labrador Retrievers at 8.1%.
Another pediatric study found pit bulls responsible for 50.4% of identified bites, with Rottweilers at 12.2%, Labradors at 8.4%, and German Shepherds at 5.3%. A separate dataset using county health department records showed pit bulls at 27.2%, German Shepherds at 10.5%, and Labs at 7.2%. The numbers vary study to study, but the same handful of breeds appear near the top each time.
Bite Force Alone Doesn’t Explain the Pattern
People often assume the breeds that cause the most injuries also have the strongest jaws. That’s not quite right. The American Pit Bull has a bite force of about 235 pounds per square inch (PSI), which is actually moderate compared to many large breeds. German Shepherds bite at roughly 238 PSI, Rottweilers at 328 PSI, English Mastiffs at 556 PSI, and Kangals at 743 PSI.
What makes certain breeds more dangerous in practice is a combination of jaw strength, body weight, tenacity during an attack, and sheer population numbers. A Kangal has triple the bite force of a pit bull, but there are far fewer Kangals in American homes. The number of injuries a breed causes reflects not just its physical capability but how many of those dogs exist in the community and the circumstances in which they’re kept.
The Breed Identification Problem
One major issue with all of this data is that breed identification after a bite is often wrong. A study from the University of Florida’s Maddie’s Shelter Medicine Program asked self-identified dog experts (breeders, trainers, veterinarians, shelter staff) to identify the primary breed of dogs from photographs. These experts got it right only 27% of the time. Each dog received an average of 53 different breed guesses across respondents. For 6% of dogs, nobody identified the correct breed at all.
This matters because most bite statistics rely on the victim, a witness, or an animal control officer visually identifying the dog. Stocky, muscular, short-haired dogs of many different breeds and mixes are routinely labeled “pit bull” after an incident. DNA testing has repeatedly shown that dogs identified as pit bulls by shelters and the public often have little or no pit bull ancestry. This means pit bull bite numbers are likely inflated compared to other breeds that have a more distinctive appearance and are easier to identify correctly.
Ownership and Environment Matter More Than Breed
The American Veterinary Medical Association has taken a clear position: any dog can bite, and breed alone is a weak predictor of whether a specific dog will cause an injury. The AVMA points to individual history, behavior, size, socialization, whether the dog is neutered, and how it’s contained as far stronger risk factors than breed. Dogs that are chained outdoors, unsocialized, unneutered, or poorly supervised are disproportionately involved in serious attacks regardless of breed.
Research on sterilization has found that spaying female dogs is associated with fewer bites, possibly because it eliminates maternal aggression. The effect of neutering males on aggression has been less consistent in studies. What is consistent is that responsible ownership variables, including proper containment, socialization from a young age, and supervision around children, reduce bite risk across all breeds.
A University of Pennsylvania study on aggression found that Dachshunds and Chihuahuas were actually the most aggressive breeds in terms of how frequently they snapped, lunged, or bit. Border Collies, Australian Cattle Dogs, Beagles, and Jack Russell Terriers all ranked above pit bulls in that study. The difference is that a bite from a 10-pound Dachshund rarely sends anyone to the hospital, while a bite from an 80-pound dog of any breed can be devastating.
Insurance and Legal Consequences by Breed
Regardless of the scientific debate, the insurance industry treats certain breeds as higher-risk. A 2025 Forbes Advisor analysis found that the breeds most commonly banned or restricted by homeowners insurance companies include pit bull terriers, Rottweilers, German Shepherds, and Great Danes. If you own one of these breeds, your insurer may charge higher premiums, refuse liability coverage, or cancel your policy entirely.
The AVMA opposes breed-specific legislation, arguing that laws should target individual dangerous dogs rather than entire breeds. Several cities and states have moved away from breed bans in recent years, but insurance restrictions remain common. If you’re considering adopting a breed that appears on restricted lists, it’s worth checking your homeowners or renters policy before bringing the dog home.