Massachusetts Dog Bite Laws Explained (Strict Liability)
Strict Liability
Massachusetts has strict liability for dog bites and for all other injuries a dog causes — under MGL c. 140, § 155 both owners and keepers are liable, and double damages apply when the owner had prior knowledge of the dog's dangerous history.
How Massachusetts Dog Bite Law Works
Massachusetts enacted MGL c. 140, § 155 to make dog owners and keepers strictly liable for any damage to the body or property of any person — not just bites, and not only when the owner is at fault. A knockdown, a claw injury, a property destruction, and a traditional bite are all covered under the same rule, and there is no requirement to prove the dog had harmed anyone before.
Section 155's 'keeper' provision is the feature that most distinguishes Massachusetts law. A keeper — anyone who is temporarily caring for the dog with the owner's permission — faces the same direct strict liability as the registered owner. Dog walkers, boarding facilities, veterinary clinics, houseguests, and pet sitters are all keepers during the time they have custody, and can be sued alongside the owner.
Where the owner knew of a prior similar incident, Massachusetts allows double damages under § 155. These are awarded by the court after a jury verdict and are mandatory once prior knowledge is established — not discretionary. A dog with a single documented prior bite or attack history, of which the owner was aware, doubles the entire damages award.
Massachusetts follows modified comparative negligence under MGL c. 231, § 85, with a 51% bar. A victim whose fault exceeds 50% of total fault is barred; at 50% or below, the award is reduced proportionally. The statute has two express defenses that can eliminate liability entirely: trespass by the victim, or the victim 'teasing, tormenting or abusing' the dog.
Three years is the filing deadline under MGL c. 260, § 2A. For a minor, MGL c. 260, § 7 tolls the period during minority. Claims against governmental entities under MGL c. 258 require presentment within two years, and the path to litigation after presentment is different from the general rule.
Fees are contingency in virtually all Massachusetts dog bite cases. Because § 155 imposes true strict liability with no fault requirement, cases with serious injuries and clear ownership are among the more straightforward plaintiff's claims in personal injury law — which typically means faster resolution, better insurance response, and less litigation than in proof-of-knowledge states.
| Liability rule | Strict liability under MGL c. 140, § 155 — covers both owners and keepers, applies to damage to body or property (not only bites). Double damages mandatory where owner had prior knowledge of a similar incident under the same section. |
|---|---|
| Governing statute | Massachusetts Dog Bite Liability StatuteMGL c. 140, § 155 |
| Deadline to file | 3 years from the date of the injuryMGL c. 260, § 2A |
| If the victim is a child | MGL c. 260, § 7 tolls the period during minority. A child bitten at any age generally has until three years after their 18th birthday — roughly age 21 — to file. |
| Shared fault | Modified comparative negligence (51% bar)MGL c. 231, § 85 |
| Cap on pain & suffering | No statutory cap on non-economic damages against private defendants in dog bite claims. The MGL c. 258 cap applies only to governmental entity defendants. |
| Does breed matter? | No statewide breed-specific law. § 155 is breed-neutral — liability runs on the fact of harm, not on the dog's breed or any prior classification. |
| Dangerous dog law | MGL c. 140, § 157 (licensing and keeping of dogs); § 158 (licensing requirements). No statewide dangerous dog designation law separate from local orders to restrain or remove. |
Statute text verified against the official source linked above. General information, not legal advice.
What Does Massachusetts' Dog Bite Statute Cover?
MGL c. 140, § 155 is broader than most state dog bite statutes. It covers damage to both body and property, not just bites, and it imposes strict liability on both owners and keepers — meaning a person who is caring for the dog, even temporarily, faces the same liability as the registered owner.
Section 155 provides that if any dog 'shall do any damage to either the body or property of any person,' the owner or keeper is strictly liable unless the damage was occasioned by the victim's trespass or other tort, or by the victim 'teasing, tormenting or abusing' the dog. The phrase 'damage to body or property' is significant — a dog that destroys a bicycle, knocks over a person carrying groceries, or injures livestock triggers liability under the same rule as a bite.
The 'keeper' provision sets Massachusetts apart from many other states. A person who takes a neighbor's dog for the afternoon, a boarding facility caring for the animal, or a family member watching the dog while the owner travels is a keeper within the statute's meaning and can face direct liability for an attack during that period. The owner's liability continues simultaneously — both can be pursued.
Massachusetts courts have construed the statute's liability standard as true strict liability: the victim need not prove any negligence, any prior dangerous behavior, or any actual fault by the owner or keeper. The only questions are whether the dog caused the harm and whether any statutory defense applies.
Who Counts as a 'Keeper' Under MGL c. 140, § 155?
A keeper is anyone who, with the owner's permission, takes charge of or exercises control over the dog. This includes dog walkers, pet sitters, boarding facilities, houseguests watching the animal, and employers who allow an employee's dog at the workplace. Temporary control for a short period is sufficient.
The keeper definition operates alongside owner liability, not instead of it. In a Massachusetts case, both the registered owner and the person in temporary control of the dog at the time of the attack may face liability simultaneously. The injured person does not have to choose one defendant over the other.
Massachusetts courts have found keeper status where a tenant watched a landlord's dog, where an employee brought a dog to a shared office space, and where a dog was left with friends while the owner traveled. Whether someone qualifies as a keeper typically turns on whether they had actual physical custody and the authority to control the animal's movements, not on any formal agreement.
This matters practically in commercial settings. A dog groomer, a veterinary clinic, a doggy day-care facility, and a pet boarding service are all keepers during the time the animal is in their care. If a dog bites another patron or a staff member during boarding, the facility faces the same strict liability that the dog's owner faces — plus any negligence claims under the service's duty of care.
When Are Double Damages Available Under Massachusetts Law?
Section 155 allows double damages in two circumstances: when the owner or keeper knew the dog had previously caused damage of a similar kind, and when the owner is found negligent in a separate respect. Double damages under the statute are discretionary with the judge after a jury verdict on the underlying liability.
The double damages provision reads: 'If the owner or keeper of such dog knew that it was vicious or had previously caused damage, such owner or keeper shall be liable for double damages.' Knowledge of a prior similar incident — a previous bite, a prior knockdown, even a prior property destruction — triggers the enhanced remedy. The prior incident does not have to have resulted in a lawsuit; a neighbor's account, an animal control record, or the owner's own admission suffices.
In practice, double damages serve as a strong incentive to settle Massachusetts dog bite cases once prior knowledge is established. An insurer who knows the court can award twice the jury's damages on application has considerably more pressure to resolve the claim before that possibility is crystallized at trial.
The double-damages claim requires pleading and proof that the defendant had the requisite prior knowledge. This makes pre-litigation investigation — requesting animal control records, sending preservation letters, interviewing neighbors — particularly valuable in Massachusetts cases. Discovery of a prior bite record dramatically changes the settlement landscape.
How Does the Trespass and Teasing Defense Work?
Section 155 has two express defenses: the victim was committing a trespass or other tort at the time of the damage, or the victim was 'teasing, tormenting or abusing' the dog. These defenses are narrower than they appear — an adult trespasser may lose protection while a child trespasser retains it under Massachusetts attractive-nuisance principles.
The trespass defense under § 155 applies where the victim was unlawfully on the property at the time the dog caused harm. Courts distinguish deliberate adult trespass from inadvertent entry, from entry by children who cannot appreciate property boundaries, and from entry onto property where the owner has effectively invited the public by leaving access open. The defense is not available merely because the owner preferred the victim not be present.
The teasing, tormenting, or abusing defense requires conduct actually directed at the dog — not merely being near it or startling it accidentally. A child who pulled a dog's ear or repeatedly poked it may trigger this defense; a child who approached to pet the dog and was bitten typically does not. Massachusetts courts apply the defense only where the victim's conduct was the proximate cause of the dog's reaction.
Comparative negligence applies in addition to, and separate from, these statutory defenses. Where the victim's conduct falls short of the statutory threshold for eliminating liability entirely but still contributed to the incident, Massachusetts courts may apportion fault under MGL c. 231, § 85. The practical effect is that behavior that doesn't qualify as legal 'teasing' might still reduce the award by a percentage.
How Does Comparative Fault Apply in Massachusetts Dog Bite Cases?
Massachusetts uses modified comparative negligence under MGL c. 231, § 85, with a 51% bar. A victim more than 50% at fault is barred from any recovery. A victim at 50% or less recovers damages reduced by their percentage of fault. This applies on top of the statutory trespass and teasing defenses.
The Massachusetts modified comparative negligence rule bars recovery if the plaintiff's negligence was 'greater than the total amount of negligence attributable to the person or persons against whom recovery is sought.' At exactly 50/50, the plaintiff recovers; at 51% plaintiff fault, the claim is barred. This aligns with New Jersey's approach and contrasts sharply with Virginia's and Maryland's complete bars for any degree of fault.
In Massachusetts dog bite cases, comparative fault arguments typically focus on conduct that falls short of the statutory 'teasing' threshold but still shows some carelessness: approaching a dog that was growling, ignoring a warning sign, placing a hand over a fence into the dog's space. Each can generate a comparative fault argument even where the court would not find it rises to teasing or tormenting.
Children are held to a reduced comparative fault standard in Massachusetts — the reasonably prudent child of similar age and experience, not the adult standard. This parallels the keeper liability analysis: Massachusetts law gives children more latitude both as potential defendants in negligence and as victims in dog bite claims, recognizing that young children often cannot appreciate the risks an adult would recognize.
What Compensation Is Available for Massachusetts Dog Bite Victims?
Massachusetts places no cap on personal injury damages against private defendants in dog bite cases. Recoverable damages include medical expenses, lost income, pain and suffering, emotional distress, and permanent scarring or disfigurement. Double damages may be awarded where the owner had prior knowledge under § 155.
Economic damages are the documented losses: emergency treatment, reconstructive and revision surgery, physical therapy, lost wages during recovery, and future care costs. The keeper liability rule extends these claims to professional caregivers and facilities, which typically carry commercial liability insurance with higher limits than individual homeowners' policies.
Non-economic damages cover pain and suffering, emotional distress, and permanent disfigurement. Massachusetts applies no statutory ceiling on these for private defendants, so severe facial scarring, permanent nerve damage, and psychological trauma from the attack are fully compensable. The cap applicable to governmental entities under MGL c. 258 does not apply to private defendant dog bite cases.
Property damage is compensable under § 155 separately from personal injury damages, a feature that distinguishes Massachusetts law from states whose statutes cover only bodily injury. A service animal injured or killed by another dog, personal property damaged in an attack, or a bicycle destroyed by a dog are all within the statute's reach.
How Long Do You Have to File in Massachusetts?
Three years from the date of the injury under MGL c. 260, § 2A. For a minor, MGL c. 260, § 7 tolls the period during minority. Claims against governmental entities under the Massachusetts Tort Claims Act (MGL c. 258) require presentment within two years — and the period to sue after presentment is shorter still.
The three-year period begins on the date the dog caused the injury. An infection that worsens over the following weeks does not extend the period — the clock ran from the attack. The discovery rule may apply in unusual circumstances where the victim could not reasonably have known the full extent of the injury, but courts apply it narrowly and the standard limitations analysis governs most cases.
MGL c. 260, § 7 tolls the period during the victim's minority. A child bitten at age 6 generally has until the child's 21st birthday (three years from 18) to file. Parents who intend to bring a claim on behalf of the child before majority can do so, but the tolling means there is no urgency that the child's claim be filed during childhood — though waiting until majority means gathering evidence years later, when memories and records are less fresh.
Government defendants require separate notice under MGL c. 258. The Massachusetts Tort Claims Act requires a written presentment to the appropriate executive officer within two years of the injury, and then allows three years to file suit from the date presentment is denied (or six months after it is allowed, whichever comes first). A claim against a city's animal control department, a state police dog, or a municipal facility has a materially different procedural path than a claim against a private owner.
Red means the owner's insurer can use it against you. Green means Massachusetts has closed that argument off.
| Defense | Status | How it works in Massachusetts |
|---|---|---|
| Trespass or other tort by victim | Available | Express statutory defense under § 155. An adult who deliberately enters private property without permission may lose statutory protection. Child trespassers receive more latitude under attractive-nuisance principles — courts require that the trespass be a genuine cause of the incident. |
| Teasing, tormenting, or abusing the dog | Available | Express statutory defense that eliminates strict liability entirely. Requires deliberate conduct directed at the dog that caused the reaction. Accidental contact or mere proximity does not meet this threshold. |
| Comparative negligence (conduct short of teasing threshold) | Limited | Conduct falling short of the teasing/trespass threshold can reduce the award under MGL c. 231, § 85. Bars recovery only if plaintiff's fault exceeds 50%. |
| No prior knowledge (for double damages only) | Limited | Absence of prior knowledge does not defeat strict liability — it only defeats the mandatory double damages tier under § 155. Owner remains liable for full single damages regardless. |
Modified comparative negligence (51% bar). A plaintiff whose negligence is "greater than the total amount of negligence attributable to the person or persons against whom recovery is sought" is barred. At exactly 50%, the plaintiff is not barred (plaintiff's fault is not "greater than" defendant's). At 51%, the plaintiff is barred. The comparative negligence analysis sits alongside the statutory trespass and teasing defenses — conduct that does not eliminate liability outright may still reduce the award.
Example: on a claim otherwise worth $100,000, being found 30% responsible would typically leave about $70,000 — but at 51% or more, Massachusetts law bars recovery entirely.
Statute of Limitations in Massachusetts
Three years from the date of injury under MGL c. 260, § 2A. For a minor, MGL c. 260, § 7 tolls the limitations period during minority, generally giving until the victim's 21st birthday. The three-year period runs from the date the dog caused the injury — not from the date of diagnosis of a secondary condition, not from the date of a surgical consultation, and not from any later discovery. A worsening infection or a delayed nerve damage diagnosis does not restart the clock. Government defendants require a separately structured process. Under MGL c. 258, the Massachusetts Tort Claims Act, a written presentment must be filed with the appropriate governmental executive officer within two years of the date the injury was 'discovered' (which is typically the date of the incident). The government entity then has six months to act on the presentment. If it is denied (or not acted upon), the claimant has three years from denial to sue — but if it is allowed, there is a much shorter window. A claim against a city's animal control department, a town's police K-9 unit, or a state agency dog therefore follows a fundamentally different procedural path from a claim against a private owner, and the presentment must be filed well before the three-year period for private defendants would expire.
Dog bite law varies more between states than most people expect — the same attack can be a straightforward claim in one state and a difficult one across a state line.
| State | Rule | Statute | Deadline | Shared fault | What stands out |
|---|---|---|---|---|---|
| Alabama dog bite laws | Mixed statute | Ala. Code § 3-6-1 | 2 years | Contributory (any fault bars) | The statute reaches bites on the owner’s property only, and § 3-6-3 cuts the claim to actual expenses where the owner knew nothing about the dog. |
| Alaska dog bite laws | One-bite / negligence | No statute (AS 09.17.010 caps damages) | 2 years | Pure comparative | Non-economic damages capped at $400,000 — or $1,000,000 where the injury is severe permanent disfigurement. |
| Arizona dog bite laws | Strict liability | A.R.S. § 11-1025 | 1 year (statutory) / 2 years (negligence) | Pure comparative | Shortest deadline in the country for the statutory claim; breed cannot be considered by any legal decision-maker. |
| Arkansas dog bite laws | One-bite rule | No civil statute (Ark. Code § 5-62-125 criminal) | 3 years | Modified (50% bar) | Recovery is barred at exactly 50 percent fault, not 51 — and a minor’s window runs three years past majority. |
| California dog bite laws | Strict liability | Civ. Code § 3342 | 2 years | Pure comparative | Minor's claim tolled until age 18; cities cannot ban dogs by breed. |
| Colorado dog bite laws | Mixed statute | C.R.S. § 13-21-124 | 2 years | Modified (50% bar) | Strict liability reaches economic damages only, and only on serious bodily injury. A posted "Beware of Dog" sign is a complete defense. |
| Connecticut dog bite laws | Strict liability | Conn. Gen. Stat. § 22-357 | 3 years (statutory) / 2 years (negligence) | Modified (51% bar) | Covers any damage a dog does, not just bites. A child under seven is presumed not to have trespassed or teased — the burden shifts to the defendant. |
| Delaware dog bite laws | Strict liability | 16 Del. C. § 3053F | 2 years | Modified (51% bar) | Animal control is run statewide by Delaware Animal Services rather than by each city — the only state on this site with a single centralised agency. |
| District of Columbia dog bite laws | Mixed statute | D.C. Code §§ 8-1808, 8-1812 | 3 years | Pure contributory — 1% bars all recovery | Letting a dog run at large is evidence of negligence, and lack of knowledge is no excuse — but any contributory fault at all still defeats the claim. |
| Florida dog bite laws | Strict liability | Fla. Stat. § 767.04 | 2 years | Modified (51% bar) | A posted "Bad Dog" sign is a complete defense — except against a child under 6. |
| Georgia dog bite laws | Mixed statute | O.C.G.A. § 51-2-7 | 2 years | Modified (50% bar) | A violated local leash ordinance is by itself sufficient proof of vicious propensity. Fault bar sits at 50%, not 51%. |
| Hawaii dog bite laws | Mixed statute | Haw. Rev. Stat. § 663-9 | 2 years | Modified (51% bar) | The statute removes the scienter requirement but not the need to prove unreasonable conduct — except for animals dangerous by species or nature, where liability is absolute. |
| Idaho dog bite laws | One-bite rule | No civil statute; Idaho Code § 25-2805 (at large) | 2 years | Modified (50% bar) | No strict liability statute. Recovery runs on scienter or negligence, and the fault bar sits at 50%, not 51%. |
| Illinois dog bite laws | Strict liability | 510 ILCS 5/16 | 2 years (1 year vs. a local public entity) | Modified (51% bar) | Covers attacks and attempted attacks with no bite, and "owner" includes anyone who keeps, harbors or has custody of the dog. |
| Indiana dog bite laws | Mixed statute | Ind. Code § 15-20-1-3 | 2 years | Modified (51% bar) | Strict liability applies ONLY to people performing a duty imposed by law — mail carriers, meter readers, police. Everyone else gets the one-bite rule. |
| Iowa dog bite laws | Strict liability | Iowa Code § 351.28 | 2 years | Contributory negligence is not a defense | Unusually claimant-friendly: the only statutory defenses are that the victim was committing an unlawful act, or that the dog had rabies. |
| Kansas dog bite laws | One-bite rule | No civil statute — common-law scienter | 2 years | Modified (50% bar) | No dog bite statute, and the fault bar sits at 50%. Local leash ordinances do most of the practical work in establishing negligence. |
| Kentucky dog bite laws | Strict liability | KRS 258.235(4) | 1 year | Pure comparative | The statutory definition of "owner" is broad enough to make a landlord strictly liable — Maupin v. Tankersley (Ky. 2018). Only one year to file. |
| Louisiana dog bite laws | Strict liability | La. Civ. Code art. 2321 | 2 years (1 year before 1 July 2024) | Pure comparative | A civil-law jurisdiction. Prescription doubled from one year to two on 1 July 2024, and the change applies only to injuries arising after that date. |
| Maine dog bite laws | Mixed statute | 7 M.R.S. § 3961 | 6 years | Modified (50% bar) | The longest filing deadline in the country at six years — but strict liability applies only where the dog injured you OFF the owner's premises. |
| Maryland dog bite laws | Strict liability (at large) + presumption | Cts. & Jud. Proc. § 3-1901 | 3 years | Pure contributory (any fault bars) | Breed-neutral since a 2014 legislative reversal of Tracey v. Solesky — but pure contributory negligence stacked on genuine strict liability means any claimant fault, even 1%, can still zero out the claim. |
| Massachusetts (this page) | Strict liability (owners and keepers) | MGL c. 140, § 155 | 3 years | Modified (51% bar) | Keeper liability runs against anyone temporarily caring for the dog — boarding kennels, dog walkers, pet sitters — on the same strict liability terms as the owner. Double damages are mandatory (not discretionary) where the owner had prior knowledge. |
| Michigan dog bite laws | Strict liability | MCL 287.351 | 3 years | Modified — bars non-economic damages only | Over 50% fault removes pain and suffering but not medical bills. Provocation is judged objectively, so an accidental act can count. |
| Minnesota dog bite laws | Strict liability | Minn. Stat. § 347.22 | 6 years | Modified (51% bar) | Six-year filing deadline — the longest of any strict liability state on this site. The statute covers any "attack or injury," not only bites, giving full protection to victims knocked down or injured by large dogs without being bitten. |
| Mississippi dog bite laws | One-bite rule | Miss. Code § 15-1-49 (no civil bite statute) | 3 years | Pure comparative | Mississippi is one of very few states with no civil dog bite statute — claims run on common law, requiring proof the owner knew the dog was dangerous before the attack. Mississippi's pure comparative fault rule means even a plaintiff with significant fault recovers a proportional share of damages. |
| Missouri dog bite laws | Strict liability | RSMo § 273.036 | 5 years | Pure comparative | Longest filing window on this list; minor's claim tolled to 21. |
| Montana dog bite laws | Strict liability | Mont. Code § 27-1-715 | 3 years | Modified (51% bar) | Rural insurance market means coverage confirmation is a critical early investigation step — uninsured homeowners rates are higher in Montana than in most urban strict liability states on this site. |
| Nebraska dog bite laws | Strict liability | Neb. Rev. Stat. § 54-601 | 4 years | Modified (50% bar) | Four-year filing deadline — one of the longest of any strict liability state. § 54-601 covers "killing, wounding, injuring, worrying, or chasing" — broader than bite-only statutes. |
| Nevada dog bite laws | Negligence (no statute) | No dog bite statute — Glass v. Eighth Judicial Dist. Ct., 87 Nev. 321 (1971) | 2 years | Modified (51% bar) | The only state here with no dog bite statute at all. Nevada rejected the one-bite rule in 1971 — claims run on ordinary negligence. |
| New Hampshire dog bite laws | Strict liability | RSA 466:19 | 3 years | Modified (51% bar) | Defenses are statutory and narrow — only trespass and deliberate provocation (teasing, tormenting, abusing the dog) are complete defenses. Government entity claims require written notice within 60 days for municipal defendants under RSA 507-B:7. |
| New Jersey dog bite laws | Strict liability | N.J. Stat. § 4:19-16 | 2 years | Modified (51% bar) | One of the oldest strict liability statutes in the country (enacted 1933). Harboring liability extends to landlords and employers who knowingly permit a dangerous dog — both faces of the same claim, not alternatives. |
| New Mexico dog bite laws | One-bite rule | NMSA § 37-1-8 (no civil bite statute) | 3 years | Pure comparative | Government entity notice deadline is only 90 days under the New Mexico Tort Claims Act (NMSA § 41-4-16) — the shortest of any state on this site. Claims run on common law with no civil dog bite statute. |
| New York dog bite laws | Mixed statute | N.Y. Agric. & Mkts. Law § 123 | 3 years | Pure comparative | Strict liability covers medical and veterinary costs only. Flanders v. Goodfellow (Apr 2025) restored ordinary negligence claims after 19 years. |
| North Carolina dog bite laws | Mixed statute | N.C.G.S. §§ 67-4.4, 67-12 | 3 years | Pure contributory — 1% bars all recovery | The harshest fault rule in the country. Any contributory negligence at all, however slight, defeats the entire claim. |
| North Dakota dog bite laws | One-bite rule | NDCC 28-01-16(5) (no civil bite statute) | 6 years | Modified (50% bar) | Six-year filing deadline — the longest personal injury window of any state on this site. Modified 50% bar means a plaintiff at exactly 50% fault recovers nothing — stricter than the 51% bar in neighboring Wyoming and New Hampshire. |
| Ohio dog bite laws | Strict liability | Ohio Rev. Code § 955.28(B) | 2 years | Modified (51% bar) | Liability reaches the owner, keeper AND harborer. Avery's Law (Mar 2026) added a $100,000 insurance mandate for dangerous dogs. |
| Oklahoma dog bite laws | Strict liability | 4 O.S. § 42.1 | 2 years | Modified (50% bar) | Oklahoma's comparative fault bar falls at 50% — a plaintiff found exactly 50% at fault recovers nothing. This is one percentage point more restrictive than Oregon and New Jersey, where 50% plaintiff fault still allows a half-damages recovery. |
| Oregon dog bite laws | Strict liability | ORS 31.360 | 2 years | Modified (51% bar) | Oregon bans breed-specific ordinances statewide under ORS 609.205 — no city or county may restrict or regulate dogs by breed. The liability analysis under ORS 31.360 is fully breed-neutral. |
| Pennsylvania dog bite laws | Mixed statute | 3 P.S. § 459-502 (Dog Law) | 2 years | Modified (51% bar) | Strict liability covers medical costs only. Pain and suffering requires proving a "severe injury" or the dog's dangerous propensities. |
| Rhode Island dog bite laws | Strict liability | RIGL § 4-13-16 | 3 years | Pure comparative | Pure comparative fault — recovery is never barred by victim fault, regardless of the percentage. A plaintiff found 90% at fault still recovers 10% of their damages. The most plaintiff-favorable comparative fault system in New England. |
| South Carolina dog bite laws | Strict liability | S.C. Code § 47-3-110 | 3 years | Modified (51% bar) | Keeper liability is express in the statute — liability extends to any person having the dog "in their care or keeping," making dog walkers and boarding facilities directly liable on the same strict liability terms as the registered owner. |
| South Dakota dog bite laws | Strict liability | SDCL § 40-34-1 | 3 years | Slight/gross doctrine | Extends strict liability to "keepers and harborers" — not just the registered owner. Uses unique "slight/gross" comparative negligence rather than standard percentage-based fault. Government entity claims require 180-day written notice under SDCL § 3-21-2. |
| Tennessee dog bite laws | Mixed statute | Tenn. Code Ann. § 44-8-413 | 1 year | Modified (50% bar) | The only state with a "residential exclusion" — strict liability drops away if the bite happened on the owner's own residential or farm property. |
| Texas dog bite laws | One-bite rule | No statute — Marshall v. Ranne, 511 S.W.2d 255 (Tex. 1974) | 2 years | Modified (51% bar) | No dog bite statute. Recovery requires proving the owner knew of the dog's dangerous propensities, or ordinary negligent handling. |
| Utah dog bite laws | Strict liability | Utah Code § 18-1-1 | 4 years | Modified (50% bar) | Four-year filing deadline — one of the longest of any strict liability state in the country. Utah's statute also has no express lawful-presence language, making the reach of strict liability potentially broader than states with that textual limitation. |
| Vermont dog bite laws | Strict liability | 20 V.S.A. § 3461 | 3 years | Modified (51% bar) | Statute requires victim to have been "peaceably conducting himself or herself" in a lawful location — courts interpret this narrowly to exclude only deliberate provocateurs, not ordinary people in normal activity. Vermont's rural character means farm policies rather than homeowners insurance are common in agricultural-area cases. |
| Virginia dog bite laws | One-bite rule | No civil statute — common-law one-bite rule | 2 years | Pure contributory (any fault bars) | Two compounding disadvantages for victims: no strict liability statute (must prove owner's prior knowledge) plus pure contributory negligence (any fault bars entirely). Strict liability only available after a prior "dangerous dog" designation under § 3.2-6553. |
| Washington dog bite laws | Strict liability | RCW 16.08.040 | 3 years | Pure comparative | Broad strict liability, but provocation is a COMPLETE defense — and a fenced or posted property removes the implied consent that makes you lawfully present. |
| West Virginia dog bite laws | Strict liability | W. Va. Code § 19-20-13 | 2 years | Modified (51% bar) | Harboring theory expressly extends strict liability to landlords who knowingly allowed a dangerous dog on their rental property — a second defendant category not available in most strict liability states. |
| Wisconsin dog bite laws | Strict liability | Wis. Stat. § 174.02 | 3 years | Modified (51% bar) | Double damages are mandatory by statute — not discretionary — whenever the owner was notified or knew the dog had previously injured someone. The entire damages award doubles automatically once prior knowledge is established. |
| Wyoming dog bite laws | One-bite rule | Wyo. Stat. § 1-3-105 (no civil bite statute) | 4 years | Modified (51% bar) | Four-year filing deadline — the longest of any one-bite rule state on this site. Modified 51% bar means a plaintiff at exactly 50% fault still recovers half their damages, unlike neighboring one-bite states. |
Massachusetts dog bite questions, answered
The questions Massachusetts readers ask most often. General information, not legal advice.
Does Massachusetts' dog bite law cover injuries other than bites?
Yes. MGL c. 140, § 155 covers damage to "the body or property of any person" caused by a dog — not limited to bites from teeth. A knockdown by a large dog, a claw injury, or damage caused to property (a bicycle, another animal) all fall within § 155's strict liability on the same terms as a traditional bite.
What are double damages in a Massachusetts dog bite case?
Section 155 provides that if the owner or keeper "knew that it was vicious or had previously caused damage," damages shall be doubled. Double damages in Massachusetts are mandatory — not discretionary — once prior knowledge is established. A prior animal control record, neighbor complaints to the owner, or veterinary records documenting prior aggression can all establish the knowledge required. Insurers price double-damages cases materially differently from standard cases.
Can I sue a boarding facility or dog walker who was watching the dog?
Yes. Massachusetts § 155 makes "keepers" strictly liable on the same terms as owners. Anyone exercising care, custody, or control over the dog with the owner's permission is a keeper — a dog walker, a boarding kennel, a veterinary clinic, a houseguest. The owner remains liable simultaneously. Commercial keepers often carry commercial general liability insurance with higher limits than individual homeowners policies.
How does the trespass defense work in Massachusetts?
Section 155 excludes damage occasioned to a victim "committing a trespass or other tort." An adult who deliberately enters property without permission may lose statutory protection. However, child trespassers receive more protection under Massachusetts attractive-nuisance principles, and courts require that the trespass be the actual cause of the dog's opportunity to attack — not just technical trespass on the property.
How long do I have to file a Massachusetts dog bite claim?
Three years from the date of injury under MGL c. 260, § 2A. For a minor, § 7 tolls the period during minority. Government defendants — a city's animal control department, a state police dog — require written presentment to the appropriate governmental executive officer within two years under MGL c. 258. The process after presentment differs from the general filing rule, and missing the two-year presentment window bars the governmental claim.
Key Takeaways for Massachusetts Dog Bite Victims
Massachusetts follows the Strict Liability standard — that determines whether you need to prove the owner's prior knowledge or can hold them liable automatically. Understanding which standard applies is the first step in knowing whether you have a viable claim.
Your filing deadline is fixed by state law. Missing it permanently closes your case, no matter how strong the evidence is. Start the clock from the date of the bite.
Document everything from day one — photos of the injury, medical records, the dog owner's name, and any witness contact details. That documentation is the single most controllable factor in how much you ultimately recover.
Ready to understand what your case may be worth? See Massachusetts settlement amounts or connect with a Massachusetts dog bite lawyer for a free case review.
Sources & References
- 📄MGL c. 140, § 155 — Massachusetts primary statute (Justia)
- 📊CDC Dog Bite Prevention — national injury statistics and prevention guidance
- ⚖️American Bar Association — Tort, Trial & Insurance Practice