Massachusetts Dog Bite Law decides who pays when a dog injures someone — and the answer changes a great deal from one state to the next. This guide explains whether Massachusetts uses strict liability or the one-bite rule, how long you have to file, how leash and dangerous dog rules work, and exactly how a homeowners policy responds. Whether you own a dog in Massachusetts or you were bitten by one, Massachusetts Dog Bite Law is what determines the outcome.
Massachusetts Dog Bite Law is summarized here in plain English. Everything in this guide was verified against Massachusetts statutes, the state courts, and Insurance Information Institute claim data as of August 2026.
In This Massachusetts Dog Bite Law Guide:
Massachusetts Dog Bite Law: Strict Liability or One-Bite Rule?
Massachusetts is a strict liability state for dog bites. That means a dog owner is responsible for the injury even if the dog had never bitten anyone before and even if the owner did everything right. The victim does not have to prove the owner was careless.
The governing statute is M.G.L. c. 140, § 155. Statutes are amended, so confirm the current text before relying on it in a claim.
Massachusetts law says that if any dog does damage to a person’s body or property, the dog’s owner or keeper is liable for that damage. A bite victim does not have to prove the owner was careless or knew the dog was dangerous — the owner is responsible simply because it was their dog.
The owner escapes liability only if the injured person was trespassing or committing another tort, or was teasing, tormenting or abusing the dog; a child under 7 is presumed not to have done any of those things (a presumption the owner may rebut). If a minor owns the dog, the parent or guardian is liable.
The Massachusetts rule is broad — it covers not just bites but other injuries a dog causes, such as knocking a person down.
Filing Deadline Under Massachusetts Dog Bite Law
A dog bite lawsuit in Massachusetts must be filed within 3 years of the date of the injury (M.G.L. c. 260, § 2A). Miss that deadline and the claim is normally barred no matter how strong it is.
The deadline for notifying an insurance company is much shorter than the deadline for filing suit. Most homeowners policies require prompt notice, so report the incident to the insurer right away even if you have not decided whether to sue.
How Massachusetts Dog Bite Law Treats Leash Laws and Dangerous Dogs
Massachusetts has no general statewide leash law — restraint and running-at-large rules are set by city and town bylaws and ordinances, which M.G.L. c. 140, § 173 expressly authorizes. The only broad state-level restraint mandate is M.G.L. c. 140, § 174B, which requires dogs to be leashed at rest areas along state highways.
Under M.G.L. c. 140, § 157, any person may file a written complaint asking the municipal hearing authority to declare a dog a “nuisance dog” or “dangerous dog,” and the hearing authority holds a public hearing on the complaint. If the dog is found dangerous, the hearing authority may order it humanely restrained, confined indoors or in a securely enclosed pen, muzzled, altered/microchipped, or in the most serious cases humanely euthanized; the owner may appeal to district court within 10 days, and non-compliance is penalized under § 157A.
Leash rules matter far beyond the ticket. In a strict liability state, breaking a leash ordinance is powerful evidence of negligence, and it can defeat an owner’s defense outright.
Massachusetts Dog Bite Law and Homeowners Insurance
Dog bites are normally paid under the personal liability section of a standard homeowners policy — Coverage E — not under the part that repairs your house. Renters policies carry the same liability coverage.
Two other pieces of the policy come into play. Medical payments coverage (Coverage F) pays a modest amount of the injured person’s medical bills with no finding of fault, which often settles a minor bite quietly. And an umbrella policy sits above your liability limit — the single most useful thing a dog owner in Massachusetts can buy.
Coverage is not automatic. Most policies exclude injuries to people who live in your household, deliberate acts, and business-related animals. Some exclude a dog with a prior bite on record. Read the exclusions before you need them, not after.
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The 2012 statewide dog law (St. 2012, c. 193) bars cities and towns from regulating dogs in a manner specific to breed and bars a dog from being deemed dangerous based on breed, on barking or growling alone, or on a reaction to a person or animal that was not grossly disproportionate to the circumstances.
Animal bites must be reported and the biting animal quarantined for 10 days regardless of rabies vaccination status under the state rabies protocols.
Pending as of August 13, 2026: the PETS Act (S.3014), which would prohibit homeowners insurers from using dog breed in underwriting, rating and renewal decisions — it passed the Senate March 19, 2026 and the House July 15, 2026 and is in conference committee, NOT yet law.
Dog Bite Claim Costs in Massachusetts
Massachusetts Dog Bite Law decides who is liable. The claim figures below show what that liability actually costs when it lands.
State-level claim counts for Massachusetts were not available from the Insurance Information Institute at the time of writing. Nationally, dog bite and dog-related injury claims are among the costliest homeowners liability claims, and the average payout has risen every year for over a decade.
| Typical liability limit | $300,000 |
Massachusetts Dog Bite Law, Breed Restrictions and Insurance Exclusions
Massachusetts law bars cities and counties from banning specific breeds, so a local pit bull ordinance is not enforceable against you here.
Insurers in Massachusetts are generally free to refuse or surcharge coverage based on breed. This is a real risk — a policy can be non-renewed after an insurer learns which dog lives at the address.
Breeds most often excluded or surcharged by insurers:
- pit bull
- rottweiler
- german shepherd
- doberman pinscher
- chow chow
- akita
- presa canario
- wolf hybrid
Landlord and Property Owner Liability
A landlord who is neither the owner nor the keeper of the dog is outside the strict liability statute and can only be sued under common-law negligence. Under Nutt v. Florio, 75 Mass. App. Ct. 482 (2009), a landlord may be liable where they knew or should have known of the dog’s dangerous propensities on the property and failed to act reasonably to protect others.
Under Massachusetts Dog Bite Law the tenant who owns the dog is the first target of a claim, but a landlord with knowledge of a dangerous animal can be pulled in alongside them.
If you rent out property in Massachusetts, this is worth taking seriously — see our guide to liability coverage and what happens when someone is hurt on your property.
Defenses Available Under Massachusetts Dog Bite Law
Defenses recognized in Massachusetts:
- Trespassing
- Provocation (teasing
- Tormenting or abusing the dog)
- Commission of another tort by the injured person
These defenses rarely erase a claim by themselves. They more often reduce what an owner pays, which under comparative fault rules can still be a substantial difference.
How to Lower Your Liability Risk
Massachusetts Dog Bite Law sets the standard you will be judged against. These are the steps that reduce both the chance of a bite and the size of the bill if one happens:
- Raise your liability limit. Going from $100,000 to $300,000 usually costs very little per year.
- Add an umbrella policy. $1 million of extra liability typically runs $150-$300 a year.
- Tell your insurer about the dog. A non-disclosed dog is a reason to deny the claim later.
- Check your local leash ordinance. A violation is evidence against you in a civil case.
- Secure the yard and post a sign. Fencing and gate latches prevent the bite in the first place.
- Document training and vet visits. A record of responsible ownership supports the defense that you had no notice the dog was dangerous.
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Official Sources & Resources
- Insurance Information Institute — dog bite liability: iii.org
- CDC — dog bite prevention: cdc.gov
- American Veterinary Medical Association: avma.org
- Massachusetts Division of Insurance: https://www.mass.gov/orgs/division-of-insurance
- NAIC: naic.org
This is a plain-English summary of Massachusetts Dog Bite Law, not legal advice. Statutes change and every bite turns on its own facts — talk to a licensed Massachusetts attorney about a specific claim. Last verified August 2026. If something here looks out of date, please contact us.