State BSL Preemption Laws: How State Overrides Local Breed Bans

Last updated: May 23, 2026

What State Preemption Actually Does

State preemption of breed-specific legislation is a state-level statute that overrides any municipal or county breed-specific ordinance within that state. When a state preempts BSL, cities and counties in that state cannot pass new breed bans, and depending on the statute’s language, existing breed ordinances may be voided or grandfathered. Preemption is the cleanest policy vehicle for BSL reform because it captures the whole state in a single statute rather than requiring a city-by-city repeal campaign.

This article is informational, not legal advice. State preemption statutes vary in scope, exception, and effective date. Consult an animal-law attorney through the Animal Legal Defense Fund (ALDF) directory for situation-specific guidance, and verify current state law at the ASPCA or the State Legislature website before relying on any generalization.

How Many States Preempt BSL Right Now

Roughly 22 or more US states preempt local BSL per current ASPCA data. The exact count moves cycle by cycle as legislatures take up preemption bills each year. The directional trend has been upward since the late 1990s, with new preemption statutes added almost every state legislative cycle. Verify the current count at the ASPCA’s State Legislation pages or by contacting your state legislature’s research office, because any specific number you read in an article is dated the day it was written.

How Preemption Statutes Are Structured

Preemption statutes generally include one or more of three structural elements. The first is an outright prohibition: a clause that says local jurisdictions may not adopt breed-specific dog ordinances. The second is a behavior-based mandate: a clause that authorizes (or requires) local jurisdictions to address dangerous dogs through behavior-based dangerous-dog frameworks instead. The third is a grandfather clause: a provision that allows specific municipalities with pre-existing breed ordinances to keep them, or that sets a sunset date by which existing ordinances must be repealed.

Some preemption statutes carve out exceptions for specific breeds (wolf hybrids are sometimes addressed separately), for specific jurisdictions, or for specific contexts (such as state-licensed military or law-enforcement facilities). The actual scope of preemption in any given state requires reading the statute, not just relying on the ASPCA map.

Why Preemption Has Been Spreading

Three forces drive preemption adoption. First, the mainstream credentialed-organization consensus against BSL (CDC, AVMA, ASPCA, HSUS, AKC, UKC) gives state legislators institutional cover for repeal. Second, the practical experience in BSL-active jurisdictions (enforcement difficulty, breed-identification disputes, expensive litigation, no measurable bite reduction) gives legislators an evidence base. Third, constituent-side advocacy from veterinary associations, breed clubs, rescue organizations, and individual restricted-breed owners gives legislators a political constituency. Our BSL reform research guide covers the evidence base in more detail.

What Preemption Does Not Solve

State preemption of municipal BSL does not, by itself, resolve every breed-restriction problem an adopter might face. Homeowners and renters insurance carriers may still apply breed restrictions because insurance underwriting is regulated by state insurance commissioners under a different framework. HOAs and condo associations may still apply breed restrictions through private contract because HOA rules are not municipal ordinances. Landlords may still apply breed restrictions in private rental agreements (subject to Fair Housing Act assistance-animal exemptions). Airlines may still embargo certain breeds in cargo. Our insurance breed restrictions and HOA and condo breed restrictions guides walk through those parallel restriction frameworks.

What Happens When Preemption Passes

When a state passes BSL preemption, the immediate legal effect depends on the statute’s language. If the statute voids existing municipal breed ordinances, cities must stop enforcing them as of the effective date. If the statute grandfathers existing ordinances, those cities can continue enforcing until a sunset date or until they choose to repeal. If the statute prohibits new ordinances but is silent on existing ones, existing ordinances generally remain enforceable.

For adopters, the practical effect is that you should verify both the state preemption status and your specific municipality’s current ordinance. A state preemption statute does not automatically mean your city no longer enforces breed restrictions; some cities have continued to enforce ordinances that may or may not survive legal challenge under the new state statute. Consult an animal-law attorney if you face an enforcement action.

States That Have Long Preempted BSL

Some states have preempted BSL for decades. Other states have adopted preemption more recently. Rather than list a specific state count here that will be outdated within a cycle, refer to the ASPCA State Legislation page or contact your state legislature’s research office for the current list. The ASPCA also tracks pending preemption legislation in states that have not yet preempted, which is useful if you want to engage in constituent-power advocacy. Our lobbying for pet legislation guide walks through the constituent-engagement framework.

Litigation Pathways Around Preemption

Even in non-preemption states, individual BSL ordinances have been challenged on constitutional grounds. The most common challenges are due-process challenges (the “vagueness” doctrine, when an ordinance fails to define “Pit Bull type” with enough specificity that a person of ordinary intelligence can comply) and equal-protection challenges (the “rational basis” review under the Fourteenth Amendment). Outcomes have been mixed; some BSL ordinances have been struck down on vagueness grounds, others upheld under rational basis review. This is informational, not legal advice, and litigation strategy is fact-specific. Consult an animal-law attorney through the ALDF directory.

How to Verify Your State’s Current Status

The most reliable verification path is to check the ASPCA State Legislation page for your state, then cross-reference with your state legislature’s bill-tracking website (typically reachable from the state’s .gov domain), then read the actual statute. Animal-law attorneys can confirm current enforcement practice in your jurisdiction. Local breed-club chapters and rescue organizations often track current enforcement reality as well. Our guide on adopting a rescue Pit Bull includes the legal-due-diligence checklist for adopters moving across state lines.

What Advocacy Looks Like in Non-Preemption States

In states without BSL preemption, advocacy can pursue two tracks simultaneously. The state-level track works for a preemption statute, building coalitions with veterinary associations, breed clubs, rescue organizations, and credentialed-organization state chapters. The local track works for repeal of individual municipal ordinances, focusing on city council relationships, public-comment participation at council meetings, and op-eds in local press. Both tracks complement each other. Constituent-power advocacy is non-partisan; PACT Act and many state cruelty statutes have bipartisan sponsorship, and BSL reform has cross-spectrum support.

The Difference Between Preemption and Repeal

Preemption and repeal address different things. Repeal is a local action that ends a specific city or county’s breed ordinance, typically through city-council vote or municipal ballot referendum. Preemption is a state action that blocks all local breed ordinances in the state through a single statute. Repeal is often easier politically at the local level when the affected jurisdiction has experience with enforcement difficulty, while preemption is often easier at the state level where the credentialed-organization consensus carries more institutional weight than at any individual city council meeting.

Some states have pursued preemption explicitly as a vehicle for repealing existing ordinances; other preemption statutes apply only to new ordinances and leave existing ordinances in place. Reading the actual statute matters. Reform advocacy in a non-preemption state often combines both tracks: pursue state-level preemption while also working on the highest-profile local repeals to build momentum.

What Counts as Preemption Language

Statutory preemption language varies in scope. Strong preemption statutes prohibit any “breed-specific” regulation of dogs by local government, voiding existing ordinances and barring new ones. Moderate preemption statutes prohibit new breed bans but grandfather existing ones. Weak or partial preemption statutes apply to specific contexts (such as licensing or insurance) but leave other contexts to local discretion. The American Bar Association and the Animal Legal Defense Fund publish guidance on statutory drafting for state advocates working on preemption. Verify the specific language in any state’s actual statute before relying on a general label.

Frequently Asked Questions

How many states preempt BSL today?

Roughly 22 or more states preempt local BSL per current ASPCA data, but the exact count changes each legislative cycle. Verify the current number at the ASPCA State Legislation pages or your state legislature’s research office.

Does preemption automatically void existing city ordinances?

It depends on the statute’s language. Some preemption statutes void existing ordinances; some grandfather them; some prohibit only new ordinances. This is informational, not legal advice. Consult an animal-law attorney through the ALDF directory.

Does state preemption stop insurance breed restrictions?

No. Homeowners and renters insurance underwriting is regulated separately by state insurance commissioners. HOA and condo restrictions, landlord restrictions, and airline embargoes also operate outside state BSL preemption.

Can I challenge a BSL ordinance in court?

Constitutional challenges to BSL ordinances have included due-process vagueness arguments and equal-protection rational-basis challenges, with mixed outcomes. Litigation strategy is fact-specific. Consult an animal-law attorney for situation-specific advice.

What if I move from a preemption state to a non-preemption state?

Verify your new municipality’s current breed ordinance before relocating with a restricted-breed-type dog. Keep DNA testing, vaccination, training, and behavior documentation. Consult an animal-law attorney if any breed-restriction questions arise during the move.