Unvaccinated Dog Bite Laws in Maryland: Rabies Quarantine, Fines, and Legal Liability
October 15, 2026
If an unvaccinated dog bites you or someone you love in Maryland, the legal and medical fallout looks very different than a routine dog bite claim. Maryland’s unvaccinated dog bite laws trigger a chain of quarantine rules, reporting duties, and financial exposure that most pet owners never think about until it’s too late. Understanding what happens next can protect your health, your wallet, and your legal rights.
This breakdown walks through what Maryland law actually requires after a bite from a dog with no proof of rabies vaccination, from the moment animal control gets the call to the possibility of euthanasia and rabies testing.
Pro Tip: Always ask a biting dog’s owner for proof of current rabies vaccination immediately after an incident. A valid certificate can be the difference between a 10-day home quarantine and a four-month strict confinement for the animal.
What Happens If an Unvaccinated Dog Bites Someone in Maryland
The moment an unvaccinated dog bites a person in Maryland, the case stops being purely a civil injury matter and becomes a public health concern as well. Local health officials and animal control step in because rabies exposure has to be ruled out, regardless of how minor the wound looks. You can find a broader overview of the state’s rules in this guide to Maryland dog bite laws.
Maryland also applies strict liability to dog owners under Md. Code Ann., Cts. & Jud. Proc. § 3-1901. Under this Maryland dog bite statute, owners are liable if their dog is “at large” (running free in a public area), if the owner knew or should have known the dog had dangerous propensities, or even if the dog was leashed but the owner still failed to maintain proper control. Notably, the type of dog, size, weight, or breed is not relevant to that liability determination.
Because the vaccination question adds an extra layer, the outcome for an unvaccinated dog diverges sharply from a vaccinated one almost immediately. For a step-by-step look at the general bite process, see this explainer on what happens if a dog bites someone in Maryland.
Quarantine and Observation Requirements After a Dog Bite
Quarantine length depends almost entirely on whether the dog had current proof of rabies vaccination at the time of the bite. Maryland’s baseline rule, found in Health-General § 18-320, states that an apparently healthy dog, cat, or ferret that has been adequately vaccinated against rabies in accordance with § 18-318 of this subtitle or any other animal that bites a human or otherwise exposes a human to rabies shall be quarantined.
For a vaccinated dog, that quarantine typically runs 10 days at home or another approved location. For an unvaccinated dog, the picture changes substantially under COMAR 10.06.02.04, which directs owners to have the animal vaccinated against rabies immediately, and hold dogs and cats in strict quarantine for a minimum of 4 months.
| Vaccination Status | Standard Quarantine | Possible Alternative |
|---|---|---|
| Currently vaccinated | 10 days at approved location | None typically needed |
| Unvaccinated or lapsed | 4 months strict quarantine | 45-day serologic monitoring if prior vaccination is claimed |
| Status unknown/unconfirmed | Treated as unvaccinated | Owner may elect humane euthanasia for testing |
That serologic monitoring alternative can shorten the ordeal for some owners. The local health officer or animal control authority may consult with the Public Health Veterinarian to determine if serologic monitoring can be used to keep a dog or cat under the owner or custodian’s control and observed for 45 calendar days rather than under strict quarantine for 4 months if the owner or custodian of a dog or cat states that the dog or cat was previously vaccinated.
Whichever timeline applies, the animal cannot simply be taken home whenever the owner feels like it. A person may not move an animal under quarantine from the place of quarantine without the written permission of the local health officer or the Public Health Veterinarian. Owners considering how vaccination status shapes these outcomes may also want to review Maryland’s pet vaccination laws before an incident ever occurs.
Reporting a Dog Bite to Animal Control or Public Health
Maryland doesn’t leave bite reporting to chance. Maryland law requires healthcare providers to report dog bites to local health departments, but you should report independently as well. Filing your own report creates a timestamped record separate from the medical file, which matters if the case later involves a legal claim.
County-level codes reinforce this duty at the local level. In Carroll County, for example, all animal bites must be reported immediately to the Carroll County Health Department or local law enforcement authority, and the duty to make this report rests both with the owner of the animal and the person bitten. Once a report lands, the Health Department, upon receiving a report of an animal bite or suspected rabies in an animal shall take such action as it deems necessary, including but not limited to the quarantine or destruction of the animal involved.
- Report to your local animal control agency and, if appropriate, the police
- Ask the healthcare provider treating your wound to confirm they’ve filed a separate report
- Keep a copy of the report number for insurance and legal purposes
- Note the dog’s location, owner, and any visible tags or licenses
In Frederick County, the process moves quickly once vaccination status comes into question: if your pet is not vaccinated, it will need to get a rabies vaccination shot immediately and undergo a 4-month double barrier quarantine that is overseen by the Health Department and Animal Control. That kind of county-level enforcement is consistent statewide, even though administration varies by jurisdiction.
Owner Civil Liability for Dog Bite Injuries
Beyond the public health response, an unvaccinated dog bite still triggers the same civil liability framework as any other bite in Maryland, often with added weight because the vaccination lapse itself is evidence of negligence. Under § 3-1901(a), when a dog causes personal injury or death, the fact that the dog caused the injury creates a rebuttable presumption that the owner knew or should have known the dog had vicious or dangerous propensities, meaning the victim does not need to prove the dog had a history of aggression.
The definition of “running at large” has also been sharpened by recent case law. An important 2023 case, Blitzer v. Breski, clarified what “running at large” actually means under the statute: the Appellate Court of Maryland held that a dog is running at large when it is “free, unrestrained, or not under control,” and this applies even on the owner’s own property. This matters for delivery drivers, mail carriers, or neighbors lawfully present when an unrestrained dog attacks.
Owners aren’t without defenses. Even if the dog was running at large, the owner is not responsible for injuries or property damage if the victim was trespassing or attempting to trespass on the owner’s property, committing a crime, or provoking the attack. Victims generally have three years from the date of the injury to file a lawsuit over a dog bite or other injury in Maryland.
When the strict liability statute doesn’t apply, such as claims against someone other than the dog’s owner, victims may still pursue a claim under Maryland’s “one-bite” rule, which despite the name doesn’t have much to do with whether the dog has bitten anyone before, but instead focuses on whether the responsible party knew or should have known of the dog’s dangerous tendencies. Landlords aren’t automatically off the hook either: as a landlord, you may be held liable for injuries caused by your tenant’s dogs, regardless of the breed, if you had knowledge that the dog was dangerous. Other strict liability states, like Illinois and California, apply similar owner-responsibility standards, though the specific defenses and exceptions differ from Maryland’s approach.
Who Pays for Medical Care and Rabies PEP After a Bite
Medical costs after an unvaccinated dog bite go well beyond stitches. Medical expenses cover all reasonable treatment costs from emergency care through complete recovery, and dog bite injuries often require emergency room visits, rabies prophylaxis, antibiotic treatment, plastic surgery for facial injuries, and ongoing wound care that can extend for months.
Rabies post-exposure prophylaxis (PEP) is the treatment most people haven’t budgeted for. Rabies post-exposure prophylaxis involves thorough wound cleaning and irrigation, an injection of human rabies immunoglobulin (HRIG) at the wound site on day zero, and a series of four rabies vaccine injections administered on days 0, 3, 7, and 14. That protocol isn’t cheap: complete post-exposure prophylaxis costs $3,000 to $10,000 without insurance, and the rabies immune globulin alone costs $2,000 to $7,000 because the dose is based on body weight. Even with coverage, out-of-pocket costs are $500 to $3,000.
Important Note: Cost estimates for rabies PEP vary by provider, hospital, and insurance plan. Treat these figures as general planning ranges rather than a quote for your specific situation, and confirm current pricing with your treatment facility.
The dog’s owner also carries quarantine-related costs separate from your medical bills. During the quarantine period, the health officer can order a veterinary examination at any time, and the owner pays for the exam and all associated costs. Under Maryland’s civil liability framework, a bite victim can pursue the dog owner directly for medical expenses, lost wages, and pain and suffering tied to the attack and the rabies treatment protocol itself.
Fines and Criminal Penalties for Unvaccinated Dog Bites
Skipping rabies vaccination carries its own standalone penalty before a bite ever happens. Every dog, cat, and ferret in Maryland must be vaccinated against rabies by four months of age, and violating that requirement is a misdemeanor carrying fines up to $500 per offense.
That fine, though, is rarely the biggest cost owners face. The fine is often the least painful consequence, because an unvaccinated animal involved in a bite or exposed to rabies triggers quarantine requirements that can cost far more than $500 in boarding, veterinary fees, and lost time. In the most serious situations, the animal may be euthanized.
If the bite also leads to a dangerous dog determination, penalties escalate further. In addition to a civil case, you may also face criminal charges, namely criminal misdemeanor, and a fine of up to $2,500 if your dog injured someone and the dog is considered dangerous. Some states impose steeper or differently structured penalties for repeat or unvaccinated offenders; Colorado’s dog bite framework is one useful point of comparison for owners researching how enforcement varies across jurisdictions.
Dangerous or Vicious Dog Designation After a Bite
A single serious bite can permanently change how a dog is classified under Maryland law. Md. Code, Criminal Law § 10-619 outlines what is a “dangerous dog,” defined as a dog that, without provocation, has killed or inflicted severe injury on a person, or a potentially dangerous dog that bites a person, when not on its owner’s real property, kills or inflicts severe injury on a domestic animal, or attacks without provocation.
Maryland defines the severity threshold precisely. Severe injury means a physical injury that results in broken bones or disfiguring lacerations requiring multiple sutures or cosmetic surgery. Once a dog is designated dangerous, the owner must keep the dog securely enclosed on his or her property or must muzzle and restrain the dog whenever it leaves the yard. Violating those restraint requirements is itself a separate offense: a person who violates this section is guilty of a misdemeanor and on conviction is subject to a fine not exceeding $2,500.
This designation applies regardless of breed, which surprises many owners of dogs often stereotyped as aggressive. Breed-specific guides, such as this one on German Shepherd laws in Maryland or this one on Doberman laws in Maryland, address how local ordinances and insurance underwriting sometimes treat certain breeds differently even though the state’s dangerous dog statute itself is breed-neutral.
Euthanasia and Rabies Testing When Vaccination Status Is Unknown
When nobody can confirm whether the biting dog was vaccinated, Maryland law gives owners and health officials a narrow set of options, and none of them are pleasant. Under COMAR 10.06.02.04, the owner may at any time during the strict quarantine period, direct that the animal be humanely killed rather than complete the full four-month confinement.
If the dog shows signs consistent with rabies while under observation, the decision may not be left to the owner at all. If a Maryland-licensed veterinarian determines that a quarantined animal has possible rabies manifestations, the veterinarian may humanely kill the animal and submit its head promptly through the local health officer or local animal control authority to the laboratory designated by the Department for testing for rabies.
Testing itself isn’t automatic in every case. Rabies testing is not required if there is no human contact or contact with another animal, which is why confirming exactly who and what the dog contacted matters so much during the initial report. These same rabies control rules extend to cats and ferrets as well, a detail covered in this overview of feral cat laws in Maryland, since unowned or untraceable cats face comparable quarantine and testing questions when vaccination history is unknown.
Key Insight: An owner who genuinely doesn’t know a dog’s vaccination status is treated the same as an owner of a confirmed-unvaccinated dog. Missing paperwork carries the same legal consequences as no vaccination at all.
For victims, the county health department’s final determination on the animal’s status also affects your own medical decisions. If the dog cannot be located, tests positive, or dies before observation concludes, providers generally proceed with a full course of PEP out of caution rather than wait for certainty that may never come.
Maryland’s approach to unvaccinated dog bites reflects a deliberate balance: protect public health first, then sort out fault and compensation through the civil courts. If you’re dealing with a bite from a dog whose vaccination status is unclear, document everything, report promptly, and get medical guidance before making decisions about quarantine or legal claims.
Important Note: This article summarizes Maryland statutes and regulations for general informational purposes and does not constitute legal or medical advice. Consult a licensed Maryland attorney about your specific liability situation, and follow your treating physician’s guidance on rabies post-exposure prophylaxis.