Will a Dog Be Put Down for Biting Someone in Massachusetts?

Not automatically, and in most cases not at all. A single bite does not trigger euthanasia under Massachusetts law. What it triggers is a process. First comes a rabies quarantine, which is a ten-day strict confinement required by state regulation for any domestic animal that bites or scratches a person or another animal, regardless of whether the animal is vaccinated. Separately, a complaint can be brought to a municipal hearing authority under M.G.L. c. 140, sec. 157, which holds a public hearing and decides whether the dog is a “nuisance dog,” a “dangerous dog,” or neither. If the dog is deemed dangerous, the hearing authority must order at least one of a list of remedies, and euthanasia is the last and most severe item on that list rather than the default. The owner has 10 days to petition the district court, which reviews the matter fresh. Massachusetts also forbids deeming a dog dangerous based on breed, and protects a dog that reacted proportionately to defend itself, its owner, or its household. To talk through a Massachusetts dog bite, call Jim Glaser Law at (617) JIM-WINS; the first telephone consultation is free.

Two Separate Tracks Run at the Same Time, and People Confuse Them

After a bite in Massachusetts, two different legal processes can start, and they answer completely different questions.

The municipal track runs under M.G.L. c. 140, sec. 157. It is about the dog and public safety. A complaint goes to the local hearing authority, there is a public hearing, and the outcome is an order about how the dog must be kept, or in serious cases whether the dog may be kept at all. No money changes hands in this process.

The civil track runs under M.G.L. c. 140, sec. 155. It is about the injured person and compensation. It asks whether the owner or keeper owes damages for the harm the dog caused. It has nothing to say about the dog’s future.

Owners often assume a lawsuit means the dog will be euthanized. It does not. A civil claim under sec. 155 is a claim for money, usually paid by homeowner’s or renter’s insurance, and it produces no order touching the animal. The two tracks can run at once, and one does not decide the other.

The First Thing That Actually Happens: the Ten-Day Quarantine

Before any hearing, before any lawsuit, there is usually a quarantine, and it surprises owners because it is not discretionary and it does not depend on the dog’s vaccination record.

Under the state rabies regulations at 330 CMR 10.00, promulgated under M.G.L. c. 129 and M.G.L. c. 140, sec. 145B, a domestic animal that bites or scratches a person or another domestic animal is subject to a ten-day quarantine. The quarantine is strict confinement, meaning the animal is kept in a secure, escape-proof enclosure approved by the municipal animal inspector, with no contact with other animals or people beyond what is necessary for care. The point is not punishment. It is a public health observation period: a dog that was shedding rabies virus at the time of the bite would show symptoms within that window, which is what tells the health authorities whether the bitten person needs post-exposure treatment.

The municipal animal inspector, a position nominated under M.G.L. c. 129, sec. 15 and approved by the state, administers this. In many towns the quarantine is served at home when the enclosure qualifies, which is the usual outcome for a licensed, vaccinated family dog with no history. It is worth asking the animal inspector directly about home confinement rather than assuming the dog will be removed.

A quarantine is not a finding that the dog is dangerous. It is a health measure applied to every biting animal, and it ends after ten days if the animal is healthy.

The Dangerous Dog Hearing: Who Decides and What Gets Decided

The hearing process under sec. 157 begins when a person files a complaint with the hearing authority. M.G.L. c. 140, sec. 136A defines the hearing authority as “the selectmen of a town, mayor of a city, the officer in charge of the animal commission, the chief or commissioner of a police department, the chief or commissioner’s designee or the person charged with the responsibility of handling dog complaints in a town or city.” In practice, that is usually the select board, the mayor’s office, or the police chief’s designee, depending on the municipality.

The hearing authority must “investigate or cause the investigation of the complaint, including an examination under oath of the complainant at a public hearing” and then decide, based on credible evidence, whether the dog is a nuisance dog, a dangerous dog, or neither. The two categories are defined in sec. 136A and they are meaningfully different.

A nuisance dog is a dog that by excessive barking or other disturbance annoys a sick person nearby, or whose excessive barking, damage, or interference a reasonable person would find disruptive to quiet and peaceful enjoyment, or that “has threatened or attacked livestock, a domestic animal or a person, but such threat or attack was not a grossly disproportionate reaction under all the circumstances.”

A dangerous dog is a dog that either “without justification, attacks a person or domestic animal causing physical injury or death” or “behaves in a manner that a reasonable person would believe poses an unjustified imminent threat of physical injury or death to a person or to a domestic or owned animal.”

Read those definitions closely and the design of the statute becomes clear. The words doing the work are “without justification,” “unjustified,” and “not a grossly disproportionate reaction.” A bite is not automatically a dangerous dog finding. A dog that bit while being cornered, kicked, or grabbed, or while responding to someone entering the property unlawfully, may not meet the definition at all, and may fall into the lesser nuisance category or neither one.

Answer Capsule

A dog will not automatically be put down for biting someone in Massachusetts. Two processes can follow a bite. First, 330 CMR 10.00 requires a ten-day rabies quarantine in strict confinement for any domestic animal that bites or scratches, regardless of vaccination status, administered by the municipal animal inspector and frequently served at home. Second, a complaint under M.G.L. c. 140, sec. 157 goes to the local hearing authority, defined in sec. 136A, which holds a public hearing and decides whether the dog is a nuisance dog, a dangerous dog, or neither. If the dog is deemed dangerous, the hearing authority “shall order 1 or more” remedies, which include humane restraint, secure confinement, muzzling off the premises, liability insurance of at least one hundred thousand dollars, permanent identification, spaying or neutering, and, as the final listed option, that the dog be humanely euthanized. Massachusetts prohibits deeming a dog dangerous based on breed, and no city or town may regulate dogs in a breed-specific way. A dog is also not dangerous solely for growling or barking, or for reacting proportionately to defend itself, a person, or against trespass or criminal activity. The owner may petition the district court within 10 days of the order for de novo review. Separately, M.G.L. c. 140, sec. 155 makes the owner or keeper civilly liable for the damage, with exceptions for trespass, other tort, or teasing, tormenting, or abusing the dog. Call Jim Glaser Law at (617) JIM-WINS; the first telephone consultation is free.

What the Hearing Authority Can Order

If the dog is deemed dangerous, sec. 157 provides that “the hearing authority shall order 1 or more of the following,” and the list runs from mild to severe:

• That the dog be humanely restrained, with the statute specifically prohibiting an order that chains, ties, tethers, or trolleys the dog to an inanimate object such as a tree, post, or building
• That the dog be confined to the owner’s premises, with specifications for the type of secure indoor or outdoor confinement
• That the dog be muzzled and restrained by an adequate leash and under the control of a capable person whenever it is off the owner’s premises
• That the owner or keeper provide proof of liability insurance, with a statutory floor of one hundred thousand dollars
• That the dog be permanently identified, by tattoo or microchip, with the identifying information provided to the animal control officer
• That the dog be spayed or neutered
• That the dog be humanely euthanized

Two things about that list matter to an owner. It is written as one or more, so the hearing authority can impose a combination of the lesser conditions rather than the last one. And the intermediate remedies exist precisely because the Legislature wanted a range of outcomes short of euthanasia. Every restraint, confinement, muzzling, insurance, identification, and sterilization option on the list is an alternative that addresses public safety without ending the dog’s life.

That is why what happens at the hearing matters so much. This is the moment when a workable containment plan, a vet’s assessment, a training record, a fenced yard, an insurance binder, and the actual circumstances of the incident are put in front of the decision maker. An owner who shows up with nothing but a denial has left the hearing authority fewer options than an owner who shows up with a concrete plan.

Breed Cannot Be the Reason, and Neither Can Barking

Massachusetts law is explicit on two points that used to drive outcomes and no longer may.

First, “no city or town shall regulate dogs in a manner that is specific to breed.” Breed-specific municipal ordinances are barred, and a dog may not be deemed dangerous “based upon the breed of the dog.” A pit bull, a rottweiler, a German shepherd, and a labrador are all judged on what the individual dog did.

Second, a dog may not be deemed dangerous “solely based upon growling or barking.” Warning behavior is not an attack.

The statute also protects specific defensive reactions. A dog is not properly deemed dangerous for reacting proportionately to protect itself, to defend a member of its household, to respond to criminal activity, or to respond to a trespass. This is a real defense in the right case, and it turns on facts: where the person was standing, whether they had permission to be there, what they were doing with their hands, whether the dog was confined or restrained, and whether the reaction was proportionate to what was happening.

The Appeal: 10 Days, and the Court Starts Over

An order from a hearing authority is not the last word. Section 157 provides that “within 10 days after an order issued under subsections (a) to (c), inclusive, the owner or keeper of a dog may bring a petition in the district court” within the judicial district where the dog is owned or kept.

Two features of that appeal matter. The window is short. Ten days runs quickly, especially for an owner who is upset, dealing with an injured neighbor, and hoping the situation resolves itself. Missing it forfeits the review.

And the review is de novo, meaning the court hears the matter fresh rather than deferring to what the hearing authority concluded. The court may affirm or reverse. That is a meaningful second look, not a rubber stamp, and it is the reason an adverse municipal order is worth acting on immediately rather than after the fact.

What the Bite Victim’s Claim Looks Like

For the person who was bitten, the governing statute is M.G.L. c. 140, sec. 155, and Massachusetts is a strict liability state. The statute provides that “the owner or keeper, or if the owner or keeper be a minor, the parent or guardian of such minor, shall be liable for such damage.” The injured person does not need to prove the owner was careless, and does not need to prove the dog had bitten before. There is no free first bite in Massachusetts.

The statute contains exceptions. There is no liability where the damage was sustained by a person who “at the time such damage was sustained, was committing a trespass or other tort, or was teasing, tormenting or abusing such dog.” Those are the defenses an insurer will look for, and they are the mirror image of the justification language in the dangerous dog definitions.

For young children, the statute shifts the burden. If the injured minor “is under seven years of age at the time the damage was done, it shall be presumed that such minor was not committing a trespass or other tort, or teasing, tormenting or abusing such dog, and the burden of proof thereof shall be upon the defendant.” Because young children are the most frequently bitten group and the least able to explain what happened, that presumption does a lot of work.

These claims are usually paid by homeowner’s or renter’s insurance rather than out of an owner’s pocket, which is worth knowing on both sides of a bite between neighbors or family friends. The full civil picture is in Massachusetts dog bite law and owner liability, how a claim is valued is discussed in how a Massachusetts injury case is valued, and the filing deadline is covered in the Massachusetts personal injury statute of limitations.

What an Owner Should Do in the First Week

Cooperate with the animal inspector on the quarantine and ask about serving it at home. Locate the rabies certificate and the license, because a current vaccination record changes the tenor of the entire process. Write down what happened while it is fresh, including where the person was, what they were doing, and who saw it. Photograph the property, the fence, the gate, and any posted signs. Notify the homeowner’s or renter’s insurer, because the policy typically covers both the claim and the defense of it. Watch the calendar for any hearing notice, and treat a hearing as a proceeding to prepare for rather than a formality. If an adverse order issues, the 10-day petition window starts immediately.

For the person who was bitten: get medical attention and report the bite, because the report is what starts the rabies protocol and creates the record of what happened. Photograph the injuries as they heal, keep the medical bills, and be careful about early conversations with the owner’s insurer.

If you were bitten in Massachusetts and are trying to understand where you stand, the first conversation costs nothing. Jim Glaser Law can be reached at (617) JIM-WINS, a line answered 24 hours a day, and the first telephone consultation carries no charge. If it is easier, you can ask to have the firm reach out to you instead.

Frequently Asked Questions

Q: Does a dog get put down after one bite in Massachusetts?

A: Not as a matter of course. A bite does not carry an automatic euthanasia consequence under Massachusetts law. It typically triggers a ten-day rabies quarantine under 330 CMR 10.00 and may lead to a complaint before the municipal hearing authority under M.G.L. c. 140, sec. 157. If that hearing results in a dangerous dog finding, the statute directs the authority to order one or more remedies, and the list includes humane restraint, confinement, muzzling, liability insurance, identification, and spaying or neutering before it reaches euthanasia as the final option.

Q: What is the ten-day quarantine and will my dog be taken away?

A: The ten-day quarantine is a rabies observation period required by 330 CMR 10.00 for any domestic animal that bites or scratches a person or another domestic animal, regardless of vaccination status. It is strict confinement in a secure, escape-proof enclosure approved by the municipal animal inspector. In many cases a licensed, vaccinated dog with an adequate enclosure serves the quarantine at home. Ask the animal inspector directly about home confinement rather than assuming removal is required.

Q: What is the difference between a nuisance dog and a dangerous dog?

A: The definitions are in M.G.L. c. 140, sec. 136A. A dangerous dog is one that without justification attacks a person or domestic animal causing physical injury or death, or behaves so that a reasonable person would believe it poses an unjustified imminent threat of injury or death. A nuisance dog covers excessive barking and disturbance, and also a threat or attack that was “not a grossly disproportionate reaction under all the circumstances.” The nuisance category exists so that a dog whose reaction was understandable in context is not swept into the dangerous designation.

Q: Can a dog be declared dangerous in Massachusetts because of its breed?

A: No. Section 157 states that no dog shall be deemed dangerous based upon the breed of the dog, and separately provides that no city or town shall regulate dogs in a manner that is specific to breed. Breed-specific municipal ordinances are not enforceable in Massachusetts. The inquiry is about the individual dog’s conduct in the specific incident.

Q: What if my dog bit someone who was trespassing or provoking it?

A: That matters in both processes. In the municipal process, the dangerous dog definition requires the attack to be “without justification,” and the statute protects a dog reacting proportionately to defend itself, to defend a person, to respond to criminal activity, or to respond to a trespass. In the civil process, M.G.L. c. 140, sec. 155 removes liability where the injured person was committing a trespass or other tort or was teasing, tormenting, or abusing the dog. Both turn on the facts, so preserving evidence of where the person was and what they were doing is important.

Q: How long do I have to appeal a dangerous dog order?

A: Ten days. M.G.L. c. 140, sec. 157 allows the owner or keeper to bring a petition in the district court within the judicial district where the dog is owned or kept, within 10 days after the order. The court’s review is de novo, meaning it considers the matter fresh and may affirm or reverse the hearing authority’s decision. The window is short and missing it forfeits the review, so an adverse order calls for immediate action.

Q: Does the person who was bitten have to prove the owner was careless?

A: No. M.G.L. c. 140, sec. 155 makes the owner or keeper liable for the damage without proof of negligence and without proof that the dog had bitten before. The exceptions are trespass, another tort, or teasing, tormenting, or abusing the dog. For a child under seven, the statute presumes the child was doing none of those things and places the burden of proving otherwise on the defendant.

Q: If I sue over a dog bite, will the dog be euthanized?

A: No. A civil claim under M.G.L. c. 140, sec. 155 seeks compensation for the injury and is usually resolved through the owner’s homeowner’s or renter’s insurance. It produces no order about the dog. Whether a dog is deemed dangerous, and what conditions are placed on it, is decided only in the separate municipal process under sec. 157, which is triggered by a complaint to the hearing authority rather than by a lawsuit.

Q: Is Jimmy Knows AI giving me legal advice?

A: No. This article provides general Massachusetts legal information, not legal advice for your specific situation. For advice about your particular claim, call Jim Glaser Law at (617) JIM-WINS.