How BSL Works in Practice
Breed-specific legislation operates along a spectrum. At one end are outright bans — meaning a resident may not own a restricted breed within the jurisdiction at all. At the other end are "regulated" or "restricted" BSL ordinances, which permit ownership but impose additional requirements such as mandatory muzzling in public, minimum liability insurance, microchipping, sterilization, or specially secured enclosures.
When a restricted dog is identified — usually through a complaint, a licensing check, or an encounter with animal control — the owner may be given a compliance window or ordered to remove the animal from the jurisdiction. In ban jurisdictions, non-compliant dogs can be seized and, in some cases, euthanized. The enforcement process and appeal rights vary widely by location.
Understanding the legal side of owning a dog goes beyond BSL alone. See our overview of licensing, microchipping, and registration for a broader look at common pet ownership requirements.
700+
U.S. cities with some form of BSL
Animal Farm Foundation and other advocacy groups have tracked more than 700 U.S. municipalities with breed-specific ordinances, though the number shifts as laws are enacted and repealed.
~4.5M
Dog bites reported annually in the U.S.
According to the CDC, approximately 4.5 million dog bites occur in the United States each year, though the majority do not result in hospitalization.
2021
Year Denver repealed its 30-year pit bull ban
Denver, Colorado voted to end one of the country's most prominent pit bull bans, replacing it with a breed-neutral dangerous dog ordinance.
The Core Criticisms of Breed-Specific Laws
Opposition to BSL comes from a broad coalition including the American Veterinary Medical Association (AVMA), the American Kennel Club, and the ASPCA. Their objections center on several documented problems.
Visual identification is unreliable. Numerous studies have shown that even trained animal care professionals struggle to accurately identify a dog's breed by appearance alone. A 2013 study published in The Veterinary Journal found that visual breed identification was incorrect in a significant portion of cases when compared to DNA testing. This means dogs are often misclassified — and penalized — based on how they look rather than what they are.
Behavior is shaped by ownership, not breed alone. The AVMA's position on dangerous dogs emphasizes that bite risk is associated with factors including owner behavior, socialization history, training, and chaining or isolation — not breed alone. Laws that target breed rather than behavior may leave the community no safer while burdening responsible owners.
Enforcement costs are high. Municipalities that have enacted BSL often find it resource-intensive to enforce consistently, placing strain on animal control departments without clear public safety benefits to justify the expenditure.
“Dangerous dog laws should be applied to individual animals that have demonstrated a proclivity toward aggressive behavior, regardless of breed. Breed should not be the sole factor used to determine a dog's potential for dangerousness.”
— American Veterinary Medical Association, Leading U.S. professional organization for veterinarians, representing over 99,000 members
The Arguments Made in Favor of BSL
Proponents of BSL argue that certain breeds have physical traits — jaw strength, body mass, or bite style — that make attacks statistically more likely to result in serious injury when they do occur. Supporters often point to dog bite hospitalization data, arguing that even if bite frequency is not breed-dependent, severity may be.
Community members who have experienced dog attacks, particularly involving children, sometimes advocate for BSL as a precautionary measure. From a policymaking perspective, some local governments view targeted breed restrictions as a more administratively simple alternative to case-by-case dangerous-dog evaluations, which can be lengthy and legally complex.
It is worth noting that these arguments are contested within the veterinary and public health research community, and that bite severity data is often difficult to interpret cleanly because breed of dog in reported incidents is itself subject to the identification problems described above.
Know Your Local Laws Before You Move
If you own a dog of a commonly restricted breed, research the BSL status of any city or county you plan to relocate to before finalizing your move. Ordinances can vary block by block when municipal and county jurisdictions differ. Your veterinarian or a local animal welfare organization can often point you to current, reliable information on local regulations.
What This Means for Dog Owners
If you own a breed that is commonly targeted by BSL — or a mixed-breed dog that could be visually mistaken for one — it is important to know the laws in your municipality and any municipality you plan to move to. This includes checking homeowners' or renters' insurance policies, as some insurers exclude liability coverage for certain breeds regardless of local law.
Responsible ownership practices remain the most durable protection both for your dog and your community. Well-socialized, trained, and properly contained dogs of any breed pose a lower risk than poorly managed animals. For a fuller picture of what responsible ownership entails, see what responsible pet ownership actually means.
If your community is considering BSL, you have the right to participate in public comment processes. Many repeals of BSL have been driven by community members, veterinary professionals, and animal welfare advocates who presented evidence-based alternatives to their local governments.
Frequently Asked Questions
Pit bull-type dogs are the most frequently targeted, though the term covers several distinct breeds including American Pit Bull Terriers, American Staffordshire Terriers, and Staffordshire Bull Terriers. Rottweilers, Doberman Pinschers, and German Shepherds are also named in some jurisdictions. The specific breeds listed vary considerably from one law to another.
Research and policy reviews have generally not found BSL to be effective at reducing bite rates. Studies, including reviews by the American Veterinary Medical Association, suggest that bite incidents are more reliably linked to owner behavior, socialization, and training than to breed. Some communities that repealed BSL reported no increase in bite incidents afterward.
Even in jurisdictions without government-mandated BSL, landlords may impose their own breed restrictions through lease agreements. Renters should review their lease carefully and check local ordinances. For more on navigating these situations, see our guide on <a href="/pets-animals/responsible-ownership/renting-with-pets-navigating-leases-deposits-and-landlord-relationships">renting with pets</a>.
Most jurisdictions rely on visual identification by animal control officers, which is widely considered unreliable. DNA testing is rarely used. Because mixed-breed dogs may physically resemble a restricted breed without being one, misidentification is a documented problem that raises fairness concerns.
Breed-neutral dangerous-dog laws focus on the behavior of individual animals regardless of breed. These laws typically allow authorities to take action against any dog that has shown aggressive behavior, bitten someone, or been deemed a public threat. Many animal welfare advocates and veterinary groups support this approach as more equitable and effective.
No. There is no federal BSL in the United States. These laws are enacted and enforced at the state, county, or municipal level, so the rules vary significantly depending on where you live. Some states have passed laws prohibiting municipalities from enacting BSL within their borders.
The content on this site is for informational purposes only and is not a substitute for professional advice. Always consult a qualified professional for guidance specific to your situation.