Montana Dog Bite Law

How dog bite liability works in Montana

Montana's dog bite statute dates from 1943 and has one feature almost no other state shares: it stops at the city line. Inside an incorporated city or town, the owner of a dog that bites without provocation pays for the injury "regardless of the former viciousness of the dog or the owner's knowledge of the viciousness"¹. On a ranch, a county road or in an unincorporated subdivision, the statute does not apply as written, and a bitten person has to prove the owner was negligent under the general duty of ordinary care in § 27-1-701⁴. In a state where much of the population lives outside incorporated towns, that line decides many claims.

Inside town limits, the statute is a strong one. In Stroop v. Day (Mont. 1995), a Great Falls neighbor was bitten while resting his arms over a picket fence. The Montana Supreme Court held that § 27-1-715 imposes strict liability and that contributory negligence is not a defense to it. The owner can defeat the claim only by proving provocation or that the victim was not lawfully where they were². The court reaffirmed that limit on defenses in 2002³.

The Legislature rewrote the section in 2025 (Laws 2025, ch. 568). The rewrite added bites to service animals and dropped the old words "including the property of the owner"¹. A guest on the owner's property still counts as "lawfully" in a private place, because invitees and licensees are covered¹.

Neighbors differ. Idaho has a statewide liability rule, and Wyoming, North Dakota and South Dakota have no general dog bite statute. See the national table.

The Montana dog bite statute

The owner of a dog that bites a person or a service animal without provocation is liable for the damages, whatever the dog's past behavior and whatever the owner knew¹. The victim must have been in a public place, or lawfully in a private place, within an incorporated city or town¹. A person is lawfully in a private place when there to perform a duty under state or federal law or postal regulations (a mail carrier or meter reader, for example) or as an invitee or licensee of the person in possession¹. No Montana Supreme Court opinion we found has decided whether the city-limits phrase also limits bites in public places outside town, such as a county road; read literally, it applies to both.

• Law: Mont. Code Ann. § 27-1-715 (Liability of owner of vicious dog), enacted 1943; last changed 2025: Laws 2025, ch. 568, § 6 added bites to service animals and reworded the section
• Injuries covered: Bites only
• Where: Limited situations
• Who is liable: The owner
• Damages: All damages, under the ordinary rules

Other ways to prove liability

Outside the statute, Montana's general negligence rule applies: everyone is responsible for injury caused by a "want of ordinary care or skill in the management of the person's property"⁴. A bitten person outside town limits can therefore sue if the owner failed to take reasonable care: letting a dog roam, ignoring earlier aggression, or breaking a county leash or running-at-large ordinance adopted under § 7-23-2108⁴¹⁹. Stroop shows that a plaintiff can plead negligence and the statute side by side; the jury there considered both². We did not find a recent Montana Supreme Court opinion setting out a separate scienter ("one-bite") rule, so the safe statement for October 2026 is that rural claims run on ordinary negligence.

Defenses owners raise

Provocation

The statute covers only bites "without provocation"¹. In Stroop v. Day the court said provocation is decided case by case. It does not need to be intentional torment, but not every act that sets a dog off counts. Chasing the dog with a fence post four to six weeks earlier was "so remote in time" that it was not provocation, and resting your arms over the owner's fence is not provocation either².

Trespassing

A person on private property must be there lawfully: on official duty, or as an invitee or licensee¹. In Stroop the owner's warning to keep hands off the fence and the dog's earlier lunge did not turn the neighbor into a trespasser. The court found no evidence the owner had revoked permission².

Other defense

Location is a defense in practice. If the bite happened outside an incorporated city or town, the statute does not reach it and the owner can contest fault under ordinary negligence rules, including comparative fault¹⁴⁵.

Assumption of risk

Under the statute, the only defenses are the ones it lists. Stroop held that contributory negligence is no defense². In Madrid v. Fifth Judicial District Court (Mont. 2002), a livestock case, the court read Stroop to mean that assumption of the risk is also unavailable under a strict-liability statute that does not provide for it³.

Shared fault

Modified comparative fault (barred at 51%) (Mont. Code Ann. § 27-1-702).

In a negligence claim, your own negligence reduces the award by your percentage. It bars recovery only if it is greater than the negligence of the defendant, or of all defendants combined⁵. A claim under § 27-1-715 is different: Stroop v. Day held that "ideas of comparative or contributory negligence are inapplicable" to it, so a bitten person who was lawfully present and did not provoke the dog recovers in full².

How the five fault systems compare: provocation, trespass and shared fault.

Montana dog bite statute of limitations

3 years (Mont. Code Ann. § 27-2-204(1))

A suit for a dog bite injury must be filed within 3 years, the general period for liabilities not founded on a written instrument⁶. A claim for a pet or other animal killed or injured by a dog is an injury to personal property, with a 2-year period²⁵. A claim against the state must first be presented in writing to the Department of Administration, which has 120 days to decide; the limitations period pauses for those 120 days. Claims against a city or county are filed with its clerk or secretary⁹.

Children. If the bitten person is under 18 when the claim arises, the time of minority is not counted, so the 3 years start at 18 and run to the 21st birthday⁷⁸. Unlike some states, Montana puts no cap on tolling for minority; its 5-year cap applies only to involuntary commitment⁷.

Work out your own date with the dog bite claim checker, or compare deadlines in every state.

Damages

A bitten person can recover medical costs, lost earnings, pain and suffering, scarring and other losses the bite caused; § 27-1-715 makes the owner liable for the "damages that may be suffered" without a cap¹. Since 2021 medical expenses are measured by what was actually paid or is owed, not the billed amount¹². Punitive damages require clear and convincing proof of actual fraud or actual malice, such as deliberately ignoring a high probability of injury. They cannot be requested in the first complaint, and they are capped at $10 million or 3% of the defendant's net worth, whichever is less¹⁰¹¹. Awards against the state, a county or a city are capped at $750,000 per claim and $1.5 million per occurrence²⁷.

Landlords and property owners

No Montana statute makes a landlord liable for a tenant's dog. The leading opinion is Roy v. Neibauer, 191 Mont. 224, 623 P.2d 555 (1981). A tenant's cocker spaniel bit a child in a duplex yard eight days after the defendant bought the building subject to a lease that allowed the dog. The court held the new landlord owed no duty, "regardless of whether respondent had knowledge of any dangerous propensities," because he had no legal means to remove or control the dog before the bite. Montana's landlord-tenant act required at least 14 days' notice to end a lease¹³. The decision turns on control, so a landlord who has the power to act and knows of a dangerous dog remains an open question¹³.

Insurance

We found no Montana statute or insurance rule that limits how homeowners or renters insurers use dog breed in underwriting as of October 2026. State law also sets no insurance requirement for owners of dogs found vicious; § 7-23-2109 leaves those measures to county ordinances¹⁸.

More on coverage, breed exclusions and renters policies: dog bite insurance.

Stroop v. Day: the fence-line case

Montana's statute has one leading opinion, and it is a neighbor dispute. In May 1990, Hughie Stroop walked across a Great Falls alley to tell James Day about a suspicious car. He leaned on the Days' 48-inch picket fence with his hands over their yard. The dog, Stogie, ran at him; he pulled back, kept talking, leaned again, and was bitten on the hand. A jury found for the Days. The trial judge ordered a new trial, and the Montana Supreme Court agreed in Stroop v. Day, 271 Mont. 314, 896 P.2d 439 (1995)².

The court made three points that still govern. Provocation is judged case by case, and an old grievance (Stroop had chased the dog off his own yard with a fence post weeks earlier) does not count. A person with hands over a fence while talking to the owner is a licensee, and a warning does not revoke that. And the statute is strict liability: "Ideas of comparative or contributory negligence are inapplicable"². Because the bite happened inside Great Falls, the opinion did not have to address the statute's city-limits condition².

Bite reports and quarantine

Any person, including physicians, nurses and other health care practitioners, who knows of a possible rabies exposure to a human must report it immediately to the local health officer; ARM 37.114.203 lists "exposure to a human by a species susceptible to rabies infection" as reportable²⁶. The state health department's guidance for police states that ARM 32.3.1201 and 37.114.203 require all animal bites to humans to be reported immediately to the local health officer¹⁶. If the biting dog is known or suspected to have rabies, the report also goes to the state veterinarian¹⁵.

After a dog, cat or ferret bites a person, the local health officer must arrange for the animal to be observed for 10 days at an animal shelter, veterinary facility or other adequate facility. A veterinarian must evaluate any illness during that time¹⁴. The state's guidance allows home observation at the local health officer's discretion, weighing vaccination status, local rabies activity and the owner's reliability. It says the owner pays the costs of quarantine, impound, euthanasia and testing unless the local jurisdiction covers them¹⁶. If signs of rabies appear, the health officer orders the dog euthanized and its head sent to the Department of Livestock laboratory in Bozeman¹⁴.

Dangerous-dog hearings, euthanasia orders and criminal penalties are covered on Montana dangerous dog law.

Questions about Montana dog bite law

Is Montana a strict liability state for dog bites?

Only inside incorporated cities and towns. There, § 27-1-715 makes the owner liable for an unprovoked bite to anyone in a public place or lawfully on private property, with no need to show the dog had bitten before¹. The Montana Supreme Court calls that strict liability². Outside city limits you must prove the owner was negligent⁴.

I was bitten on a ranch outside town. Can I still recover?

Yes, but under negligence rather than the dog bite statute, which is limited to incorporated cities and towns¹. You have to show the owner failed to use ordinary care, for example by letting a dog known to be aggressive run loose⁴. Your own share of fault then reduces the award, and you recover nothing if it is greater than the owner's⁵.

How long do I have to sue for a dog bite in Montana?

Three years from the bite for the injury claim⁶. For a bitten child, the time before the child turns 18 does not count⁷⁸. A claim for a pet hurt by another dog is a property claim with a 2-year period²⁵.

Can the owner say I was careless?

Not under the statute. Stroop v. Day held that contributory negligence is not a defense to a § 27-1-715 claim; the owner must prove provocation or that you were not lawfully there². A later decision read Stroop to rule out assumption of the risk as well³. In a negligence claim outside city limits, your carelessness does count⁵.

Does the statute cover a dog that knocks someone down without biting?

No. Section 27-1-715 applies to a dog that "bites"¹. A knock-down or a fall while fleeing a dog has to be brought as a negligence claim under § 27-1-701⁴.

What if a dog attacks my service dog?

Since the 2025 amendment, § 27-1-715 also covers an unprovoked bite to a service animal in a public place or lawfully on private property within a city or town¹. An owner who negligently lets a dog harm or interfere with a service animal or its handler also commits a misdemeanor²⁴.

Official contacts

Sources

1. Mont. Code Ann. § 27-1-715, Liability of owner of vicious dog, Montana Legislature (MCA 2025). Checked 17 October 2026.
2. Stroop v. Day, 271 Mont. 314, 896 P.2d 439 (1995), Caselaw Access Project, Harvard Law School. Checked 17 October 2026.
3. Madrid v. Fifth Judicial District Court, 2002 MT 291, 312 Mont. 517, 60 P.3d 438, Caselaw Access Project, Harvard Law School. Checked 17 October 2026.
4. Mont. Code Ann. § 27-1-701, Liability for negligence as well as willful acts, Montana Legislature (MCA 2025). Checked 17 October 2026.
5. Mont. Code Ann. § 27-1-702, Comparative negligence, Montana Legislature (MCA 2025). Checked 17 October 2026.
6. Mont. Code Ann. § 27-2-204, Tort actions: general and personal injury, Montana Legislature (MCA 2025). Checked 17 October 2026.
7. Mont. Code Ann. § 27-2-401, When person entitled to bring action is under a disability, Montana Legislature (MCA 2025). Checked 17 October 2026.
8. Mont. Code Ann. § 41-1-101, Minors and adults defined, Montana Legislature (MCA 2025). Checked 17 October 2026.
9. Mont. Code Ann. § 2-9-301, Filing of claims against state and political subdivisions, Montana Legislature (MCA 2025). Checked 17 October 2026.
10. Mont. Code Ann. § 27-1-221, Punitive damages: liability, proof, award, Montana Legislature (MCA 2025). Checked 17 October 2026.
11. Mont. Code Ann. § 27-1-220, Punitive damages: when allowed, limitation, Montana Legislature (MCA 2025). Checked 17 October 2026.
12. Mont. Code Ann. § 27-1-308, Reasonable value of medical services in bodily injury actions, Montana Legislature (MCA 2025). Checked 17 October 2026.
13. Roy v. Neibauer, 191 Mont. 224, 623 P.2d 555 (1981), Caselaw Access Project, Harvard Law School. Checked 17 October 2026.
14. ARM 37.114.571, Rabies exposure, Administrative Rules of Montana (via Cornell LII). Checked 17 October 2026.
15. ARM 32.3.1201, Reporting rabies, Administrative Rules of Montana (via Cornell LII). Checked 17 October 2026.
16. Rabies Guidance for Law Enforcement (CD0019G2, rev. 06/2017), Montana Department of Public Health and Human Services. Checked 17 October 2026.
17. Rabies, Montana Department of Public Health and Human Services. Checked 17 October 2026.
18. Mont. Code Ann. § 7-23-2109, Vicious dog control, Montana Legislature (MCA 2025). Checked 17 October 2026.
19. Mont. Code Ann. §§ 7-23-2108 and 7-23-4101, County and city control of dogs, Montana Legislature (MCA 2025). Checked 17 October 2026.
20. Mont. Code Ann. § 45-5-208, Negligent endangerment, Montana Legislature (MCA 2025). Checked 17 October 2026.
21. Mont. Code Ann. § 45-5-104, Negligent homicide, Montana Legislature (MCA 2025). Checked 17 October 2026.
22. Mont. Code Ann. § 81-7-401, Killing of dogs harassing, destroying, or injuring stock, Montana Legislature (MCA 2025). Checked 17 October 2026.
23. Mont. Code Ann. § 81-7-402, Liability of owner of dog for damages to livestock or poultry, Montana Legislature (MCA 2025). Checked 17 October 2026.
24. Mont. Code Ann. § 45-8-227, Harassment or harm of service animal, Montana Legislature (MCA 2025). Checked 17 October 2026.
25. Mont. Code Ann. § 27-2-207, Injuries involving property, Montana Legislature (MCA 2025). Checked 17 October 2026.
26. ARM 37.114.203, Reportable diseases and conditions, Administrative Rules of Montana (via Cornell LII). Checked 17 October 2026.
27. Mont. Code Ann. § 2-9-108, Limitation on governmental liability for damages in tort, Montana Legislature (MCA 2025). Checked 17 October 2026.