Maryland Rabies Vaccine Law: Boosters, Exemptions, and Penalties

Under Maryland’s rabies vaccine law, every dog, cat, and ferret must be vaccinated against rabies by four months of age, and the requirement applies whether the animal ever sets foot outside. Skipping the shot is a misdemeanor punishable by fines of up to $500 per animal.¹ The bigger risk sits behind the fine: an unvaccinated pet involved in a bite or exposed to a rabid animal faces either euthanasia or months of strict quarantine at your expense.

Which Pets Need the Vaccine, and by When

Maryland’s rabies regulations require every owner or custodian of a dog, cat, or ferret to have the animal vaccinated by four months old.² Indoor-only cats are not exempt. Apartment dogs are not exempt. The rule sits in COMAR 10.06.02, the state’s rabies control chapter.

Don’t bring an animal younger than three months to a rabies clinic. Pets under three months, and those that are pregnant, nursing, sick, or injured, should be evaluated by a veterinarian before receiving the vaccine.

How Often Boosters Are Due

The first rabies shot is good for one year. After that, booster shots are valid for up to three years depending on which product the veterinarian uses. Your vet will tell you whether the specific vaccine administered carries a one-year or three-year duration, and the certificate will show the expiration date.

Keep the Vaccination Certificate

When the vaccine is administered, your veterinarian issues a certificate. That paper is your legal proof of compliance, and Maryland’s Department of Agriculture regulations prohibit vets from issuing blank or incomplete ones. Each certificate must carry the veterinarian’s signature, your pet’s description (age, sex, breed), and the date and type of vaccination.³

Keep it where you can find it fast. You need it to license the animal, and if your pet ever bites someone or tangles with wildlife, the certificate is the single document that decides what happens next. Owners who can’t produce a current, or even expired, certificate get dramatically worse outcomes in both situations.

Licensing Depends on It

Local animal control agencies cannot license or register a dog, cat, or ferret without first verifying rabies vaccination through a current certificate.² If the vaccination lapses, the license lapses. Fees and deadlines vary by county, and some jurisdictions run reduced-cost rabies clinics; check with your county animal control office for local rates.

The Fine for Not Vaccinating

Failing to comply with any provision of Maryland’s rabies chapter, or failing to follow an order from the local health officer, State Epidemiologist, or Public Health Veterinarian, is a misdemeanor. On conviction the fine reaches $500 for each offense.¹ Each unvaccinated animal counts separately, so an owner with several unvaccinated pets faces stacked fines. The misdemeanor classification also puts a conviction on your record, which is a heavier consequence than most owners expect from a lapsed shot.

What Happens After a Bite

When a dog, cat, or ferret bites a person, or has non-bite contact that could transmit rabies (a scratch, for example), Maryland law requires the animal to be quarantined for at least 10 days.⁴ The quarantine has to happen in a location and manner approved by the local health officer or Public Health Veterinarian. The health officer can order a veterinary examination at any point during those 10 days, and you pay for the exam and any costs that follow. The animal cannot be moved from the quarantine location without written permission.

If a veterinarian sees possible signs of rabies during quarantine, the animal may be humanely killed and its head submitted for laboratory testing. Owners cannot refuse to surrender a live or dead animal for quarantine, euthanasia, or testing when the health officer or Public Health Veterinarian issues a written order.

If Your Pet Is Exposed to a Rabid Animal

This is the scenario that catches owners off guard, and Maryland draws a sharp line between vaccinated and unvaccinated animals.

Vaccinated Pets

If your pet has a current or even expired rabies certificate and gets exposed to a rabid animal, the path forward is manageable. You must have the animal revaccinated immediately and then keep it under your control, observed for 45 days.⁵ That observation typically happens at home.

Unvaccinated Pets

If you cannot produce any rabies certificate, the options are grim. You must either have the animal humanely killed, or vaccinate it immediately and place it in strict quarantine for a minimum of four months for dogs and cats, or six months for other animals. That quarantine has to happen in a facility approved by the Public Health Veterinarian, and you pay all costs.⁵

One narrow exception exists. If you tell the health officer the animal was previously vaccinated but the certificate can’t be found, the local health officer may consult the Public Health Veterinarian about using blood testing to shorten the quarantine to 45 days of observation instead of four months of strict confinement. That alternative is discretionary, not guaranteed. It’s the reason keeping the certificate matters so much.

If the animal violates quarantine terms, shows signs of developing rabies, or bites or contacts another person or animal during quarantine, the health officer can order the animal euthanized for rabies testing.

Medical Exemptions and the Titer Question

Maryland does not offer a broad medical exemption that your own veterinarian can grant. The state-level Public Health Veterinarian has authority to delay the vaccination requirement temporarily or indefinitely for specific animals, and delays may be granted for medical reasons, public safety, or research.² If your pet has a health condition that makes vaccination risky, your vet has to work through the Public Health Veterinarian’s office.

A common question: can a titer test (blood test showing rabies antibodies) substitute for revaccination? Under Maryland law, no. Titer results are not recognized as a legal substitute for current vaccination anywhere in the state’s regulations. National veterinary guidance from the American Animal Hospital Association and the American Association of Feline Practitioners reaches the same conclusion: a positive titer likely correlates with protection, but veterinarians do not have legal authority to swap a titer for an actual vaccination.

Pets Brought Into Maryland

The vaccination rule reaches animals imported from other states or countries too. If a dog, cat, or ferret is brought into Maryland in violation of the requirements, the Public Health Veterinarian or local health officer can order the owner to return the animal to its point of origin at the owner’s expense.⁶ If no one takes financial responsibility for the animal within 48 hours, the local animal control authority can treat it as abandoned and either euthanize it or place it for adoption.

For dogs entering the United States from abroad, federal CDC rules add a separate layer, including a 28-day waiting period after a first rabies vaccination before travel certification can be issued; boosters are valid immediately as long as coverage has not lapsed.⁷

1
Legal Information Institute. Maryland Code of Regulations 10.06.02.14 – Penalty
2
Legal Information Institute. Maryland Code of Regulations 10.06.02.10 – Vaccination of Animals
3
Maryland Department of Agriculture. Title 15 Department of Agriculture – Chapter 05 Health Certificate and Rabies Certificate for Companion Animals
4
Legal Information Institute. Maryland Code of Regulations 10.06.02.07 – Disposition of Animals Following Bite
5
Library of Maryland Regulations. COMAR 10.06.02 – Communicable Diseases, Rabies
6
Library of Maryland Regulations. COMAR 10.06.02.04 – Animal Rabies
7
Centers for Disease Control and Prevention. Documents for Veterinarians to Complete for Dogs Being Imported into the United States