Who Is Liable for a Dog Bite in Massachusetts?

In Massachusetts, a dog owner is strictly liable for injuries their dog causes. You do not need to prove the owner knew the dog was dangerous, and you do not need to show the dog had bitten anyone before. If a dog bites or attacks you, the owner is responsible for your medical bills, lost wages, and pain and suffering under M.G.L. c. 140, sec. 155. The only exceptions involve trespassers and people who were tormenting or abusing the dog at the time of the attack.

The Massachusetts Dog Bite Statute: Strict Liability

Massachusetts is a strict liability state for dog bites. The controlling statute is M.G.L. c. 140, sec. 155. Under strict liability, the plaintiff does not have to prove:

• That the owner knew the dog had a history of aggression
• That the owner was careless in restraining or supervising the dog
• That the dog had bitten anyone before (the old “one free bite” rule that applies in some other states does not apply in Massachusetts)

The plaintiff must prove only three elements:

1. The defendant owned or harbored the dog
2. The dog injured the plaintiff
3. The plaintiff was not trespassing, not committing a tort, and was not teasing, tormenting, or abusing the dog at the time of the injury

If those three elements are established, liability is automatic. The owner cannot escape responsibility by pointing to the dog’s prior good behavior or their own careful management.

Answer Capsule

Massachusetts dog owners are strictly liable under M.G.L. c. 140, sec. 155. If a dog bites or knocks you down and you were lawfully present and not provoking the dog, the owner must compensate you for all resulting injuries. There is no “one free bite” rule in Massachusetts. Compensation can include medical expenses, lost wages, scarring and disfigurement, pain and suffering, and emotional distress. Contact Jim Glaser Law at (617) JIM-WINS for a free evaluation of your dog bite claim.

What “Strict Liability” Means for Your Claim

Strict liability removes the biggest hurdle most injury victims face: proving someone was negligent. In a typical personal injury case, you must show the defendant failed to act reasonably. Dog bite strict liability eliminates that requirement entirely. The owner is liable simply because they owned the dog that hurt you.

This matters in practice because:

• You do not need to find neighbors willing to testify that the dog was aggressive before the attack.
• You do not need to dig up prior incident reports or veterinary records showing a history of aggression.
• You do not need to prove the owner left the dog unsupervised or failed to use a leash.

The evidence you need is straightforward: proof of ownership (or that the defendant was keeping the dog), medical records documenting your injuries, and evidence placing you lawfully at the scene.

Who Qualifies as an “Owner or Keeper” Under the Statute

The statute imposes liability on the dog’s “owner or keeper.” Owner is the registered owner or person who acquired the dog. Keeper is a broader term that covers anyone who habitually harbors or controls the dog, even without formal ownership.

Common scenarios where keeper liability may apply:

• A landlord who allows a known aggressive dog on the property and exercises control over the premises
• A family member or roommate who regularly feeds, exercises, and controls the dog while the owner is away
• A dog-sitter or boarding facility that has taken temporary custody of the dog

If the dog’s registered owner is uninsured or judgment-proof, investigating keeper liability can be critical to recovery. A homeowner’s or renter’s insurance policy covering the keeper may be the source of compensation.

The Two Statutory Defenses

The statute recognizes two situations where the owner is not liable:

Defense 1: The Plaintiff Was Trespassing

If the injured person was trespassing at the time of the attack, the owner is not liable under sec. 155. Trespassing means the person was on private property without the owner’s express or implied permission.

Important nuances:

• A person who entered with permission initially but whose permission was revoked before the attack may or may not qualify as a trespasser depending on the circumstances.
• Children are sometimes treated differently. A young child who wanders onto a neighbor’s property may not be a trespasser in the legal sense, depending on the attractive-nuisance doctrine and other premises-liability principles.
• A mail carrier, delivery driver, or utility worker entering in the scope of their duties is not a trespasser, even if they enter without the owner’s explicit daily invitation.

Defense 2: The Plaintiff Was Teasing, Tormenting, or Abusing the Dog

If the injured person was provoking the dog at the time of the attack, the owner is not liable. The provocation must be active and directed at the dog at the moment of the attack. A person who walked past a dog without interacting with it was not provoking it, regardless of what happened moments before.

Children are again a special consideration. Young children who grab a dog’s ears or tail may technically be teasing the dog, but courts sometimes analyze whether a child of that age had the capacity to understand that their conduct was provocative.

What You Can Recover After a Dog Bite in Massachusetts

If the owner’s liability is established under M.G.L. c. 140, sec. 155, you are entitled to full compensatory damages. The statute does not cap recoverable damages for dog bite victims.

Economic damages:

• All past and future medical expenses: emergency room treatment, surgery, hospitalization, wound care, plastic surgery for scarring, physical therapy, and psychiatric or psychological treatment for trauma
• Lost wages from time missed at work during recovery
• Future lost earning capacity if permanent injury or disfigurement affects your career
• Out-of-pocket expenses (transportation to medical appointments, prescription medications, home care equipment)

Non-economic damages:

• Pain and suffering, past and future
• Permanent scarring and disfigurement (dog bites to the face, hands, and neck are particularly serious and often leave visible permanent scarring)
• Emotional distress and post-traumatic stress disorder, which are common after a violent dog attack
• Loss of enjoyment of life

Massachusetts does not cap non-economic damages in personal injury cases outside the medical malpractice context.

Dog Bites and Homeowner’s or Renter’s Insurance

In most dog bite claims, the source of compensation is the dog owner’s homeowner’s or renter’s insurance policy. Standard policies typically include personal liability coverage that pays for injuries the policyholder’s dog causes to third parties.

What this means practically:

• You do not need to sue the dog owner personally or go after their personal assets. The claim is typically handled by their insurer.
• If the owner rents rather than owns their home, their renter’s insurance policy may cover the claim. If they have no renter’s insurance, you may need to pursue the owner directly or investigate whether the landlord bears any liability.
• Some insurance policies exclude certain breeds (such as pit bulls, Rottweilers, or German shepherds) or exclude dogs with prior bite histories.

Jim Glaser Law investigates all available insurance coverage at the start of every dog bite case, including the owner’s homeowner’s policy, any umbrella coverage, and any potential landlord liability.

What to Do Immediately After a Dog Bite in Massachusetts

The steps you take in the hours and days after an attack directly affect both your health and your legal claim. Owners tend to ask a different question first, and it is worth knowing the answer whichever side of the bite you are on: a bite triggers a ten-day rabies quarantine and can lead to a municipal hearing, but it does not automatically mean the dog is euthanized. That process is set out in whether a dog is put down for biting someone in Massachusetts.

1. Seek medical treatment immediately. Dog bites carry a serious risk of infection, including from bacteria such as Pasteurella, Capnocytophaga, and in rare cases Staphylococcus aureus. An emergency room physician will clean and assess the wound, prescribe antibiotics if needed, evaluate rabies risk, and document the injury in a medical record that becomes the foundation of your legal claim.

2. Identify the dog and its owner. Get the owner’s name, address, and phone number. Ask whether the dog’s rabies vaccination is current. If bystanders witnessed the attack, collect their contact information as well.

3. Report the bite to local animal control. In Massachusetts, dog bites are reportable to the local animal control officer. Animal control records document the incident independently of your medical records and can be subpoenaed in litigation.

4. Photograph your injuries. Take photographs of the wounds before and after treatment, on the day of the attack and throughout your recovery. Photograph the location where the attack occurred. If you can safely do so, photograph the dog.

5. Preserve clothing and other evidence. Torn or bloodied clothing is evidence of the attack and the severity of the incident. Do not wash or discard it.

6. Do not give a recorded statement to the dog owner’s insurer before speaking with an attorney. The insurer may contact you quickly after a report is made. Their adjuster is working to minimize the payout, not to help you. Statements about the circumstances of the attack, including where you were standing and what the dog was doing before it bit you, are used to argue the trespasser or provocation defenses. Call Jim Glaser Law at (617) JIM-WINS before speaking with any insurer.

Statute of Limitations for Dog Bite Claims in Massachusetts

A dog bite claim in Massachusetts is a personal injury tort claim. The general personal injury statute of limitations under M.G.L. c. 260, sec. 2A requires that suit be filed within three years of the date of the injury. Missing this deadline permanently bars your claim, regardless of how serious your injuries are.

For claims involving injured minors, the limitations period is typically tolled until the minor turns 18, but the rules are nuanced. Parents or guardians who bring a loss-of-consortium or medical-expense claim on behalf of an injured child may face a different deadline from the child’s own claim.

See also: Massachusetts Personal Injury Statute of Limitations for a full discussion of how the three-year rule applies across personal injury claims.

Frequently Asked Questions

Q: Who is liable for a dog bite in Massachusetts?

A: The dog’s owner or keeper is strictly liable under M.G.L. c. 140, sec. 155. You do not need to prove the owner was negligent or that the dog had a history of aggression. Liability is automatic if you were lawfully present and not provoking the dog at the time of the attack.

Q: Does the “one free bite” rule apply in Massachusetts?

A: No. Massachusetts imposes strict liability under M.G.L. c. 140, sec. 155, which means the owner is liable even if the dog had never shown aggression or bitten anyone before. Prior behavior is irrelevant to liability, though it may affect damages in some cases.

Q: What if the dog knocked me down without biting me?

A: The statute covers injuries caused by a dog, not just bites. If a dog jumps on you, knocks you to the ground, and you suffer a broken wrist, the same strict liability standard applies.

Q: What if I was partly at fault for the dog bite?

A: The trespasser and provocation defenses are the statutory defenses available to the owner. Massachusetts comparative negligence under M.G.L. c. 231, sec. 85 may also apply to the extent the plaintiff’s own conduct contributed to the injury outside of those two statutory defenses. See also: Comparative Negligence in Massachusetts.

Q: What if the dog owner does not have homeowner’s insurance?

A: You may still pursue the owner personally. Jim Glaser Law investigates all potential sources of recovery, including renter’s insurance, umbrella policies, and potential landlord liability, at the outset of every case. Call (617) JIM-WINS to discuss your specific situation.

Q: How much is a dog bite claim worth in Massachusetts?

A: It depends on the severity of your injuries, the extent of scarring and disfigurement, the impact on your work and daily life, and available insurance coverage. Dog bites to the face, hands, and neck often produce permanent scarring that generates significant non-economic damages. Jim Glaser Law evaluates every dog bite case individually. Call (617) JIM-WINS for a free assessment.

Q: How long do I have to file a dog bite claim in Massachusetts?

A: Generally three years from the date of the bite under M.G.L. c. 260, sec. 2A. Special rules apply for injured minors. Do not wait: evidence degrades, witnesses become unavailable, and insurers become harder to deal with as time passes.

Q: Is Jimmy Knows AI giving me legal advice?

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