Pet Vaccination Laws in Maryland: What Every Owner Needs to Know

If you own a dog, cat, or ferret in Maryland, state law has specific vaccination requirements you are responsible for meeting — and the consequences of falling short go beyond a simple fine. Maryland’s pet vaccination framework is rooted in public health, designed to keep rabies from crossing from wildlife into the domestic animal population and, ultimately, into people.

Understanding exactly what the law requires, which animals it covers, and how local rules can layer on top of state minimums gives you the clearest picture of your obligations as a pet owner. This guide walks through every aspect of Maryland’s pet vaccination laws so you can stay compliant and keep your animals protected.

Which Vaccines Are Required by Law in Maryland

Maryland’s mandatory vaccination framework is narrowly focused but firmly enforced. In Maryland, certain vaccines are legally required, while others are strongly recommended to keep your pet healthy. When it comes to what the law actually mandates, the answer is straightforward: rabies is the only vaccine explicitly required under state law.

A statewide regulatory system regarding rabies, currently specified in Title 18, Subtitle 3, of the Health-General Article of the Maryland Code and COMAR 10.06.02, requires that each person who owns or keeps a dog, cat, or ferret that is at least four months old shall have it vaccinated adequately against rabies. No other vaccine carries the same legal mandate at the state level.

Key Insight: Rabies vaccination is the only vaccine required by Maryland state law. All other vaccines, while medically recommended, are not legally mandated by the state.

That said, local jurisdictions and certain facilities — such as boarding kennels, doggy daycares, and grooming services — may require additional vaccinations as a condition of entry. Ensuring your dog is up-to-date on vaccinations is one of the most important aspects of responsible pet ownership, and in Maryland, certain vaccines are legally required while others are strongly recommended to keep your pet healthy. Always check with your specific county and any pet service providers you use, as their requirements may go further than the state baseline.

If you are also navigating feral cat laws in Maryland, it is worth noting that Baltimore City specifically includes feral cats under its rabies vaccination and documentation requirements.

Rabies Vaccination Requirements in Maryland

Rabies is treated as a serious public health matter in Maryland, and the state’s vaccination law reflects that seriousness. Maryland law requires that all dogs, cats, and ferrets four months and older be vaccinated against rabies. This is not a one-time obligation — it is a continuous requirement that follows your pet throughout its life.

Pet owners in Maryland must maintain a valid rabies vaccination certificate as proof that their animal is protected. This certificate is a legal document that must be completed using a specific official form. It contains essential details, including the date the vaccine was given, the date the next shot is due, and the signature and license information of the veterinarian who oversaw the vaccination.

An owner or custodian of an animal required to be licensed or registered shall have the animal adequately vaccinated and shall obtain a valid rabies vaccination certificate on the form specified by the Department. The certificate shall be completed and signed by a Maryland-licensed veterinarian or, in the case of public antirabies clinics, the certificate may be issued under the authority of the Public Health Veterinarian.

Pro Tip: After each vaccination, your veterinarian must also issue a rabies tag. Keep this tag on your pet’s collar at all times — it is your animal’s most visible proof of compliance.

Public antirabies clinics and veterinarians who provide rabies vaccination services to dogs, cats, and ferrets shall promptly issue to the owner of each vaccinated animal a rabies certificate, tag, and s-shaped metal link for attaching the tag on the animal’s collar. If you bring a pet into Maryland from out of state, additional documentation rules apply. The owner or custodian of a dog, cat, or ferret at least four months old brought into the State of Maryland shall forward to the state’s Public Health Veterinarian or designee within 10 days of the animal’s arrival in the state a certificate by a licensed veterinarian that documents the animal is vaccinated against rabies.

Owners are required to show the vaccination certificate to police, health officials, or animal control officers if they ask to see it. Keeping a physical or digital copy readily accessible is a practical habit worth developing.

Which Animals Are Covered Under Maryland’s Vaccination Laws

Maryland law and regulation require all dogs, cats, and ferrets age 4 months and older to be adequately vaccinated against rabies. These are the only three species specifically named under the state’s mandatory vaccination statute. Other domesticated animals — rabbits, guinea pigs, hamsters, and birds, for example — are not subject to the same legal vaccination requirement.

It is worth understanding why these three species are singled out. In Maryland, rabies is most frequently found in wildlife, most commonly raccoons, foxes, skunks, and bats. Domestic animals, including livestock, are also at risk, and cats are the most frequently identified rabid domestic animal. Dogs, cats, and ferrets have the most direct and frequent contact with both humans and wildlife, making them the highest-priority targets for mandatory vaccination.

Animal	Covered by Maryland Rabies Law?	Minimum Vaccination Age
Dogs	Yes	4 months
Cats	Yes	4 months
Ferrets	Yes	4 months
Rabbits	No	N/A (not mandated)
Birds	No	N/A (not mandated)
Livestock	No (separate quarantine rules apply)	N/A (not mandated)

Baltimore City extends the legal definition slightly further. No person may own or keep a dog, cat, feral cat, or ferret that is older than 4 months unless it has a current rabies vaccination, unless this requirement is waived by the Public Health Veterinarian. If you manage or care for feral cats in Baltimore City, this requirement applies to you as well.

If you are curious about the rules surrounding other animals in Maryland, you may also want to review hedgehog ownership laws in Maryland or goat ownership laws in Maryland, as those animals fall outside the rabies vaccination mandate but are subject to their own regulations.

Vaccination Age Requirements and Booster Schedules in Maryland

The initial vaccination deadline is clear: an owner or custodian of a dog, cat, or ferret shall have that animal adequately vaccinated against rabies by the time the dog, cat, or ferret is 4 months old. From there, the booster schedule depends on the specific vaccine product used and your veterinarian’s guidance.

Initial vaccination should be given at 4 months of age. A booster shot is required one year later. After the initial booster, the rabies vaccine must be administered every one to three years, depending on the type of vaccine used and local regulations.

For dogs specifically, in Maryland, rabies vaccine is required for puppies, then one year later, and every three years thereafter. For cats, the schedule mirrors this: in Maryland, rabies vaccine is required for kittens, then at one year of age, then every three years thereafter.

Important Note: Maryland law does not impose a single fixed booster interval for every animal. Instead, the law requires that the next vaccination be given by the date listed on the official certificate. Your pet’s certificate governs its schedule — not a general rule of thumb.

The timing for follow-up shots is based on the specific instructions for the vaccine used and official health recommendations. Rather than following a single fixed schedule for every animal, the law requires that the next vaccination be given by the date listed on the pet’s official certificate. This ensures that every animal maintains a continuous level of protection against the virus.

This is a continuing requirement. The certificate should state the date by which the next vaccination is due so that the animal is continuously protected against rabies. Missing that date — even by a short period — technically puts your pet out of compliance with state law.

Pet licenses in Maryland are directly tied to vaccination status. Licenses are only valid while the pet’s rabies vaccination is valid. When your pet’s vaccination lapses, so does its license.

Medical Exemptions From Vaccination Requirements in Maryland

Maryland does provide a pathway for animals that genuinely cannot receive the rabies vaccine due to health conditions, but this is not a self-declared exemption — it requires state-level authorization.

The Public Health Veterinarian may delay temporarily or indefinitely the rabies vaccination requirement for certain dogs, cats, or ferrets in the interest of public safety or for medical determinations or research. This authority rests entirely with the Maryland Public Health Veterinarian, not with your individual vet or with local animal control.

In specific situations, the Maryland Public Health Veterinarian has the authority to delay the rabies vaccination requirement for an animal. This typically happens for medical reasons where a vaccination might not be appropriate at that time or because the animal is part of a research program. These delays are not automatic and are granted on a case-by-case basis based on the needs of the animal and the safety of the community.

Pro Tip: If your veterinarian believes your pet has a medical condition that makes rabies vaccination risky, work with your vet to submit a request to the Maryland Public Health Veterinarian. Do not simply skip the vaccination without formal approval — your pet will still be considered out of compliance.

Owners who believe their pet requires a delay should consult with their veterinarian, as the state must approve any deviation from the standard vaccination timeline to ensure the pet remains in legal compliance. Until a formal delay is granted, a local animal control authority may not license or register a dog, cat, or ferret without verifying the rabies vaccination status as documented by a current rabies vaccination certificate.

Medical exemptions are genuinely rare. They are intended for animals with documented immune conditions, serious allergies to vaccine components, or terminal illnesses — not for owners who prefer to avoid vaccinations as a matter of personal preference.

Local Laws That May Add Requirements in Maryland

Maryland’s state law establishes the floor for pet vaccination requirements, but individual counties and cities can — and do — build on top of it. While state regulations provide the baseline for rabies control, local counties and cities play a major role in day-to-day enforcement. Local animal control agencies are responsible for checking vaccination records, issuing licenses, and responding to reports of unvaccinated pets. They work alongside public health officials to monitor local animal populations and prevent outbreaks within their specific communities.

Pet licensing is one of the most common local additions. In Montgomery County, by law and beginning at four months of age, all dogs and cats must have a Montgomery County Pet License. In Wicomico County, a dog older than six months must have a County license, and its owner is required to obtain such license.

Baltimore City adds specific requirements around documentation custody. Whenever the owner of an animal places it in the care or custody of another person, the owner must provide that custodian with a copy of the animal’s rabies vaccination certificate. This means that when you drop your dog off at a boarding facility, a friend’s house, or a groomer in Baltimore City, you are legally required to hand over a copy of the vaccination record.

Key Insight: Some counties also require licensing for cats, not just dogs. Check with your specific county’s animal control office to confirm whether cats in your area must be licensed and what documentation is required.

Because local rules can sometimes be more specific than state law, pet owners should check with their county or city animal control office for any additional requirements. Low-cost public rabies clinics are available across the state to help owners stay compliant. In conjunction with the Department, each local health department shall provide for low-cost, self-financing, antirabies clinics for animals in each county and Baltimore City.

If you are also researching how Maryland’s animal laws compare to neighboring states, you may find it useful to look at dog leash laws in Pennsylvania or dog leash laws in Delaware for broader regional context.

Recommended Vaccines Beyond What the Law Requires in Maryland

While rabies is the only legally mandated vaccine in Maryland, veterinarians throughout the state strongly recommend several additional vaccines based on your pet’s lifestyle, environment, and risk exposure. These are not legally required, but skipping them can leave your animal vulnerable to serious and preventable diseases.

For dogs, the core recommended vaccine beyond rabies is the DAP or DHPP combination. Canine distemper, adenovirus, and parvovirus — known as the “distemper” or “DAP” vaccine — is important for puppies to receive several times. Because this vaccine is a modified live virus vaccine, once the immune system is competent, revaccination may not be needed in every adult, depending on their individual immune system. Vaccine or antibody titers are measured to determine if revaccination for DAP is necessary.

Maryland’s environment creates specific risk factors that make several non-core vaccines worth serious consideration:

• Lyme disease: In Maryland, the deer tick or black-legged tick, Ixodes scapularis, is the common vector for Lyme disease. Dogs that spend time outdoors in areas where ticks are common are at risk for Lyme disease and should be vaccinated. Revaccination is needed yearly to protect against Lyme disease.
• Leptospirosis: Leptospirosis is a bacterial-like organism that infects dogs through contact with infected urine. Many other animals can carry the organism, such as rats, pigs, raccoons, cattle, skunks, and opossums. There are many types of leptospira that can infect dogs. Dogs who spend a lot of time outdoors, especially near water or moist environments, are at risk for leptospirosis and should be vaccinated. This organism can also be passed to people and cause devastating disease.
• Bordetella (kennel cough): Bordetella and parainfluenza are two organisms that may cause infectious and contagious tracheobronchitis, also known as kennel cough, in dogs. Dogs at risk are those exposed to other dogs especially in boarding kennels, dog parks, dog shows, or groomeries. This vaccination is very effective given by the intranasal route and requires yearly boosters.
• Canine influenza: Recent regional outbreaks of canine influenza have caused concern for the spread of canine influenza. Dogs that board or travel frequently may be at risk and vaccination should be considered.

For cats, the FVRCP combination vaccine is widely recommended. Feline rhinotracheitis, calicivirus, and panleukopenia vaccine — also known as “feline distemper” or FVRCP — is a multivalent vaccine that protects against common viruses found in cats. This vaccine is given several times to kittens until the immune system is mature, then every one to three years in adult cats, depending on their environment.

Feline leukemia is another important consideration for cats with outdoor access. Feline leukemia is a highly contagious respiratory and immune-compromising virus that is contracted by contact with infected cats. Kittens that will have potential exposure to other cats, especially by going outdoors, should receive a series of feline leukemia vaccines, then yearly boosters as adults. Indoor cats with no exposure to any outside cats may not need this vaccine.

Talk with your veterinarian about which of these vaccines makes sense for your specific animal based on where you live, how much time your pet spends outdoors, and what other animals it comes into contact with. You can also explore neighbor’s cat laws in Maryland if you are concerned about unvaccinated cats from neighboring properties interacting with your pets.

Penalties for Non-Compliance in Maryland

Failing to vaccinate your pet as required by Maryland law carries real consequences — some financial, some more serious. The penalties operate at both the state and local level, and they can escalate quickly depending on the circumstances.

Failing to follow rabies vaccination laws can lead to legal penalties that vary depending on where you live. In some jurisdictions, such as Baltimore City, violating these health rules is treated as a misdemeanor offense. Fine amounts also depend on local rules; for example, Montgomery County may charge pet owners a $500 fine for failing to vaccinate their animals. In Montgomery County, failure to have a license is subject to a $100 fine on top of any vaccination-related penalties.

Beyond fines, an unvaccinated animal involved in a biting incident or potential rabies exposure faces strict quarantine protocols. If a pet is involved in a biting incident or has contact with a human that could spread the virus, strict safety protocols apply. The animal must be quarantined for at least 10 days in a manner approved by health officials to monitor for signs of disease. If a veterinarian or public health official determines the animal may be showing signs of rabies, they have the authority to order the animal be humanely killed for testing to protect the public.

The quarantine burden is significantly heavier for unvaccinated animals. If the owner or custodian of a domestic animal that has been exposed to a rabid animal, or to an animal suspected of having rabies, is able to provide a current or expired rabies vaccination certificate for the animal, the owner or custodian shall have the animal re-vaccinated against rabies immediately and keep the animal under the owner or custodian’s control and observed for 45 calendar days.

Without any vaccination history, the consequences are much more severe. If the owner or custodian of a domestic animal that has been exposed to a rabid animal is unable to provide a current or expired rabies vaccination certificate, the animal must be vaccinated against rabies immediately and held in strict quarantine — dogs and cats for a minimum of 4 months, and other animals for a minimum of 6 months — in a facility and manner approved by the Public Health Veterinarian. The owner or custodian of a domestic animal that is being held in strict quarantine is responsible for all costs related to strict quarantine of the animal.

Common Mistake: Some owners assume that because their pet stays indoors, the vaccination requirement does not apply to them. Maryland law makes no such distinction — the requirement applies regardless of whether your pet goes outside.

Additionally, under Maryland’s criminal law, an owner or other person having charge or custody of an animal who unnecessarily fails to provide the animal with necessary veterinary care is subject to imprisonment and/or fine. In the most serious cases, non-compliance with vaccination laws can intersect with animal neglect statutes.

Staying current on your pet’s rabies vaccination is the simplest way to avoid all of these outcomes. If cost is a barrier, each local health department shall provide for low-cost, self-financing, antirabies clinics for animals in each county and Baltimore City — making access to affordable vaccination available statewide.

For more on how Maryland regulates animal ownership and welfare, see our guides on roadkill laws in Maryland, backyard chicken laws in Maryland, and exotic pet laws in the United States. If you own pets in other states, our state-by-state guides on dog leash laws in Ohio, dog leash laws in Florida, and dog leash laws in Tennessee may also be helpful resources.