Aggressive Dog Laws in Maryland: Definitions, Owner Duties, and Liability
November 2, 2026
Aggressive dog laws in Maryland are built on one state statute and a patchwork of county rules. The state sets the definitions and the baseline owner duties, but counties and municipalities decide most of what happens in practice, from who investigates a complaint to how a hearing works.
That split catches people off guard. A rule that applies in Baltimore County may look different in Worcester County, and a breed restriction in one county may not exist in the next one over.
This article explains how Maryland defines a dangerous dog, how a designation happens, what owners must do afterward, and where civil liability fits in. It is general legal information, not legal advice, so check your local animal control ordinance or talk with a Maryland attorney about a specific situation.
Aggressive Dog Laws in Maryland: Quick Overview
Maryland’s main dangerous dog law is Criminal Law § 10-619. It creates two labels, “potentially dangerous” and “dangerous,” and it hands the job of applying them to local government. The state does not use the word “aggressive” as a legal category, so “aggressive dog” in everyday speech usually maps onto one of those two labels.
Civil liability is a separate track. A bite victim’s right to sue comes from Courts and Judicial Proceedings § 3-1901, not from the dangerous dog statute, and a dog does not need a formal designation for the owner to face a lawsuit.
| Topic | Where It Lives | Who Applies It |
|---|---|---|
| Dangerous and potentially dangerous labels | Criminal Law § 10-619 | County or municipal unit |
| Civil liability for bites | Courts and Judicial Proceedings § 3-1901 | Courts |
| Killing a dog attacking people or livestock | Local Government § 13-105 | Individuals (limited circumstances) |
| Leash, licensing, breed rules | County and city codes | Local animal control |
What Counts as an Aggressive, Dangerous or Vicious Dog in Maryland
Under the statute, Criminal Law § 10-619 defines a dangerous dog as one that, without provocation, has killed or inflicted severe injury on a person. A dog can also become “dangerous” if a county or municipality first found it potentially dangerous and it then bites a person, kills or severely injures a domestic animal while off its owner’s property, or attacks without provocation.
“Severe injury” has a specific meaning in the statute: a physical injury that results in broken bones or disfiguring lacerations requiring multiple sutures or cosmetic surgery. A minor nip or a scratch does not meet that bar.
Potentially Dangerous Dogs
The lower tier is “potentially dangerous.” A county or municipal unit may apply it if it finds the dog has bitten a person on public or private property, has killed or severely injured a domestic animal while off its owner’s property, or has attacked without provocation. The owner must be notified in writing of the reasons.
What “Owner’s Real Property” Means
This definition matters more than most owners expect. “Owner’s real property” means land owned or leased by the owner, and it excludes public rights-of-way and common areas of a condominium, apartment complex, or townhouse development. A dog that attacks another animal in your apartment building’s courtyard is legally “off” your property.
Vicious Dog Labels at the Local Level
Some counties add their own “vicious” tier. For example, Anne Arundel County’s “Lilo’s Law” designates dogs that kill other domesticated animals as vicious animals. The state statute also does not apply to a dog owned by and working for a governmental or law enforcement unit.
How a Dog Is Declared Dangerous in Maryland
Designation usually happens in steps. After a first incident, animal control can classify the dog as potentially dangerous, and a second incident can move it to dangerous. That ladder gives an owner a chance to change the dog’s circumstances before the stricter label attaches, although a single unprovoked attack causing severe injury can skip straight to “dangerous.”
Because the state leaves the process to local units, hearing rights and paperwork can differ between counties even though they share the same state framework. Frederick County, for instance, issues a written order explaining the reasons for the determination and directing the owner to comply with conditions for keeping the animal.
- An incident occurs and is reported to local animal control or police.
- The local unit investigates, which may include witness statements, medical records, and photos of injuries.
- The unit decides whether the dog meets the potentially dangerous or dangerous definition.
- The owner receives written notice of the reasons.
- The owner can contest the finding through the local appeal or hearing process, which varies by county.
Important Note: Appeal deadlines are set locally and can be short. If you receive a written determination, read the notice for the deadline the same day and contact your county animal control office or an attorney right away.
Who Can Report an Aggressive Dog in Maryland
Anyone can report a dog that has bitten, attacked, or threatened people or animals. Bite victims, witnesses, neighbors, veterinarians, and other pet owners all file complaints with the county or municipal animal control agency where the incident happened.
A Maryland injury law firm’s guide notes that state law expects animal attacks to be reported to local animal control authorities. In practice, a report creates the record that a later designation depends on, so details matter.
- Date, time, and exact location of the incident
- Description of the dog and, if known, the owner’s name and address
- Photos of injuries and the scene
- Medical records, if anyone was treated
- Names and contact details of witnesses
If a person was seriously hurt, call 911 first and report to animal control afterward. For rabies-related questions after a bite, see our guide to pet vaccination laws in Maryland.
Dangerous Dog Owner Requirements in Maryland
Once a dog is declared dangerous, the state requires containment. An owner may not leave a dangerous dog unattended on their property unless it is confined indoors, in a securely enclosed and locked pen, or in another structure designed to restrain it. The dog may not leave the property unless leashed and muzzled, or otherwise securely restrained and muzzled.
The statute also controls transfers. An owner of a dangerous or potentially dangerous dog cannot sell or give it away without notifying the local authority in writing, with the new owner’s name and address, and warning the new owner in writing about the dog’s behavior.
Penalties for Violations
According to RecordingLaw’s Maryland summary, violating the dangerous dog statute is a misdemeanor punishable by a fine of up to $2,500. Check the current statute text before relying on that figure, since penalties can be amended.
Local Add-Ons
Counties can stack more rules on top of the state baseline. The table below shows examples drawn from local ordinances.
| Jurisdiction | Added Requirement |
|---|---|
| Frederick County | Owner must notify the Director within 24 hours if a dangerous or potentially dangerous dog is loose, attacks, dies, or is sold or given away |
| Frederick County | Muzzle and a restraint of no more than four feet when removed for medical care |
| Baltimore City | Visible dangerous animal sign, plus a perimeter fence if the animal is kept outside |
Those examples come from our breakdown of vicious animal laws in Maryland, which also covers non-dog animals. Owners of dogs with a bite history may also want to read about dog bite laws in Maryland for the insurance and liability side.
Can an Aggressive Dog Be Euthanized in Maryland?
Yes, but only in defined situations. A designation under § 10-619 on its own does not order euthanasia; it imposes containment rules. Destruction typically comes through a separate local order, a court proceeding, or a voluntary decision by the owner.
State law gives individuals one narrow right. Under Local Government § 13-105, a person who kills a dog under the described circumstances is immune from civil liability and criminal penalty. Those circumstances are seeing the dog in the act of pursuing, attacking, wounding, or killing poultry or livestock, or attacking a human being.
Some counties also have specific authority. In Harford County, after a finding that a dog disturbs the peace of a neighborhood or is vicious and has bitten an individual, the District Court may require the owner to surrender the dog to be euthanized or remove it permanently from the neighborhood. Cecil County has a similar prohibition on keeping a vicious domestic animal that bites.
Common Mistake: Treating § 13-105 as a general right to kill a threatening dog. It applies when you see the act in progress, and anything outside that narrow window can expose you to cruelty or property claims.
Maryland Dog Bite Liability: Strict Liability or One-Bite Rule
Maryland has moved away from a pure one-bite approach. One firm’s explainer states that Maryland does not follow the traditional “one bite” rule and instead imposes strict liability even if it is the dog’s first bite. Sources describe the exact legal mechanics differently, so the details are worth understanding.
Under § 3-1901, which took effect on April 8, 2014, an owner is presumed to know their dog’s dangerous propensities when the dog injures someone. That presumption is rebuttable, and an owner can present evidence showing they had no reason to believe the dog was dangerous.
Important Note: Some law firm summaries call this “strict liability,” while others describe a rebuttable presumption plus common-law negligence. Treat the outcome as fact-specific and confirm with a Maryland attorney.
Common Defenses
- The injured person was trespassing or committing a crime
- The injured person teased, tormented, abused, or provoked the dog
- The owner can rebut the presumption of knowing the dog was dangerous
Maryland also follows contributory negligence, so a victim found to have contributed to the incident in any way may be barred from recovering compensation. The full picture is covered in our dog bite law resource, and landlords should note that the 2012 Tracey v. Solesky decision declared pit bulls “inherently dangerous” and imposed strict liability on owners and landlords before the 2014 statute changed the framework.
Leash and Running-at-Large Laws in Maryland
Maryland has no single statewide leash law for all dogs. Leash and running-at-large rules come from county and municipal codes, and most counties require dogs to be restrained or under control when off the owner’s property.
Running at large also carries civil consequences. Under § 3-1901, an owner is strictly liable for injuries caused when the dog is “running at large,” regardless of whether it was previously known to be vicious. Even where no leash ordinance applies, an unrestrained dog raises your exposure.
- Check the leash and licensing ordinance for your county or city before walking off-property
- Keep dogs on a physical leash in public unless a posted off-leash area allows otherwise
- Secure fences and gates, since an escaped dog is a running-at-large dog
- Dangerous dogs need both a leash and a muzzle off the property, not one or the other
Service dog handlers face the same responsibilities for control. Our guide to service dog laws in Maryland explains how those rules interact with public access rights.
Local and Breed-Specific Rules in Maryland
Maryland has no statewide ban on specific breeds. There is no official list of “dangerous” dog breeds under Maryland law, and courts do not automatically assume liability based solely on breed.
Local rules can differ. One Maryland firm reports that Prince George’s County has restricted pit bull-type dogs, with a maximum fine of $1,000. Prince George’s County has changed its pit bull rules over the years, so confirm the current ordinance with county animal management before acting on that figure.
Breed-related questions also come up for specific breeds. See our pages on German shepherd laws in Maryland and Doberman laws in Maryland for breed-focused guidance.
Pro Tip: Before adopting or moving counties with a dog, call the local animal control office and ask three questions: whether breed restrictions exist, whether a dangerous dog registry applies, and what the leash rule is. Landlords and insurers often add their own breed limits too.
When an Aggressive Dog Attacks Other Pets or Livestock in Maryland
Attacks on animals count under the dangerous dog statute. A dog that, while off its owner’s property, kills or severely injures a domestic animal can be labeled potentially dangerous and later dangerous after another incident. Counties can go further, as Anne Arundel’s Lilo’s Law does.
Livestock and poultry get separate treatment. A person may kill a dog seen attacking livestock or poultry, and counties may compensate livestock owners. The governing body of a county, by local law or ordinance, may provide for compensation of a person whose poultry or livestock is destroyed or injured by a dog. If the county adopts no such law, it is not required to compensate.
When the dog’s owner is known, the governing body shall direct the owner to euthanize the dog immediately. If the owner refuses, the owner is liable for damages as in a case of negligence or malicious destruction of property, and the governing body may direct special officers to euthanize the dog.
If your own pet or flock was attacked, document everything, report to animal control, and keep veterinary bills. Flock owners may also want our pages on backyard chicken laws in Maryland and goat ownership laws in Maryland.
Aggressive Dog Laws in Maryland: Frequently Asked Questions
Is Maryland a One-Bite State?
Not in the traditional sense. Maryland law presumes an owner knew of a dog’s dangerous tendencies after an injury, though the owner can try to rebut that. A first bite can still lead to liability.
Is There a Statewide List of Banned Breeds?
No. The state does not ban breeds, though some counties and landlords impose their own restrictions.
Can Animal Control Take My Dog After a Bite?
It depends on the county and the facts. Local units can investigate, impose conditions, and in some cases seize or quarantine an animal. Hearing rights vary by jurisdiction.
Can I Be Charged If My Dog Is Declared Dangerous and Escapes?
Yes. Failing to confine or muzzle a dangerous dog as required is a misdemeanor under the statute, and a bite on top of that adds civil exposure.
Does the Dangerous Dog Law Apply to Police Dogs?
No. The statute exempts dogs owned by and working for a governmental or law enforcement unit.
Where Can I Read the Law Myself?
People’s Law Library of Maryland summarizes the dog bite and dangerous dog rules in plain language. For the statute itself, the Animal Legal and Historical Center’s consolidated dog laws gather the main provisions in one place.
Aggressive dog cases turn on specific facts and local procedure, so contact your county animal control office early. An attorney can help if a designation, a lawsuit, or an order to destroy a dog is on the table.