State Dog Bite Law

Dog bite law in all 50 states and D.C., cited to the statute and dated

Every state checked against its statutes, October 2026

Montana Dangerous Dog Law

Reviewed For dog owners and bite victims

After a dog bites someone in Montana, the local health officer arranges a 10-day rabies observation, usually at a shelter or vet, sometimes at home1416. Whether the dog is then declared vicious, restricted or destroyed depends on county or city ordinances, because state law sets no statewide dangerous-dog procedure18.

After a bite in Montana

Rabies observation10 daysDetails below
State dangerous-dog lawMont. Code Ann. § 7-23-2109Vicious dog control (county ordinances)
Classes of dogvicious dog
Required insurance for a declared dogNo statewide minimum
Breed-specific lawsAllowed: cities and counties may adopt them
Civil liability for the bitePartial strict liability

What happens first: the bite report

Montana treats a dog bite to a person as a possible rabies exposure, and the local health officer, usually the county health department, runs the response. ARM 37.114.203 makes "exposure to a human by a species susceptible to rabies infection" a reportable condition26, and anyone who knows of one, including the treating doctor, must report it to the local health officer immediately26. The Department of Public Health and Human Services tells police that all animal bites to humans must be reported immediately and lists what an officer should collect: the victim's and owner's details, where on the body the bite landed, the dog's name and description, its veterinarian and its latest rabies vaccination record16. Expect a call or visit from animal control or the health department, and keep the vaccination certificate where you can find it.

The 10-day observation

The health officer must arrange for the dog to be watched for signs of illness for 10 days "at an animal shelter, veterinary facility, or other adequate facility"14. State guidance allows home observation at the officer's discretion. The officer weighs whether the dog is vaccinated, how much rabies is in the area, and how reliable the owner seems16. If the dog falls ill, changes behavior or dies during the 10 days, a veterinarian must examine it16. If the signs are consistent with rabies, the health officer orders the dog euthanized and the head sent to the Department of Livestock's diagnostic laboratory in Bozeman14. The rule also lets the officer order euthanasia after isolation so the brain can be tested14.

The guidance places the costs of quarantine, impound, euthanasia and testing on the owner unless the local jurisdiction pays16. A dog that is part wolf is treated as a wild animal: it cannot be observed, and testing is the only way to rule out rabies16. A healthy dog that finishes its 10 days without symptoms has ruled out rabies for that bite. The CDC's finding, repeated by DPHHS, is that no one in the United States has caught rabies from a dog, cat or ferret that stayed healthy through a 10-day observation17.

Is there a dangerous-dog hearing in Montana?

Not under state law. Montana has no statewide dangerous-dog statute of the kind found in most states. Instead, § 7-23-2109 lets each county "regulate, restrain, control, kill, or quarantine any vicious dog, whether the dog is licensed or unlicensed" by ordinance18. The statute defines a vicious dog as one "that bites or attempts to bite any human being without provocation" or that harasses, chases, bites or attempts to bite another animal, including livestock, service animals and pets. The 2025 amendment added service animals18. Cities and towns regulate dogs under their own powers19.

This means the procedure, the standard of proof, the restrictions and the appeal deadline all come from your county or city code. Some ordinances use an administrative hearing before an animal control officer, others a municipal court or the council. If you receive a notice that your dog has been declared vicious, read the ordinance it cites and note the appeal deadline on the notice; those windows are often short.

What restrictions can follow?

State law sets no list. It sets no insurance minimum, no registration and no muzzle requirement18. Typical local orders include confinement in a secure enclosure, leash and muzzle rules off the property, warning signs, extra license fees and, after a serious attack, destruction of the dog. Violating a county vicious-dog ordinance is a misdemeanor18.

When can a dog be killed?

Three routes exist. The health officer can order euthanasia for rabies testing14. A county ordinance under § 7-23-2109 can authorize killing a vicious dog, and § 7-23-2108 lets counties impound or destroy dogs found at large against an ordinance1819. And livestock law has its own rule. A dog that, off its owner's premises, harasses, kills or injures someone else's livestock on the livestock owner's land is a public nuisance. The livestock owner may kill it immediately, or the dog's owner must kill it within 24 hours of notice. The killing may not endanger a person, and working herding, hunting and predator-control dogs under their owner's direction are exempt22. The dog's owner also faces a misdemeanor fine of up to $50022 and must pay the livestock's value, whether or not they knew the dog's habits23.

Can the owner be charged with a crime?

Montana has no statute aimed specifically at dog attacks on people. Owners face charges in three ways. First, a violation of a local vicious-dog or running-at-large ordinance is a misdemeanor1819. Second, the general criminal code applies when an owner's negligence is serious. Negligent endangerment, conduct that creates a substantial risk of death or serious bodily injury, carries up to a year in county jail and a $1,000 fine20. Negligent homicide, if someone dies, carries up to 20 years and $50,00021. Third, since October 2025 an owner who negligently lets a dog obstruct, intimidate or harm a service animal or its handler commits a misdemeanor with a fine of up to $1,00024.

Breed rules

No state statute bans breed-specific ordinances or requires them. The state definition of a vicious dog turns on what the dog did, not its breed18. Check your city or county code for any local breed rule.

If the dog bites again

A second bite starts the same report and 10-day observation14. It also tends to bring the vicious-dog ordinance into play if it was not used the first time. Civilly, inside city limits the owner is already liable for any unprovoked bite whether or not the dog had bitten before1. Outside town, an earlier bite is the kind of evidence that makes a negligence claim much easier to prove4. See what to do if your dog bit someone and the national dangerous-dog comparison.

Rules for a declared dog in Montana

RequirementRule
Rabies observation after a bite10 days at a shelter, vet or other adequate facilityARM 37.114.571(4); home observation at the health officer's discretion.1416
Costs of observation and testingOwner pays, unless the local jurisdiction covers themDPHHS guidance.16
Vicious-dog restrictionsSet by county or city ordinance§ 7-23-2109; § 7-23-4101.1819
Liability insuranceNo state requirement§ 7-23-2109 sets none.18
Breaking a vicious-dog ordinanceMisdemeanor§ 7-23-2109(2).18

Montana rules in brief

Reporting. 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.

Euthanasia. Montana has no statewide dangerous-dog hearing. A county may adopt an ordinance to "regulate, restrain, control, kill, or quarantine any vicious dog"18, and cities regulate animals under their own powers19. Notice, hearing and appeal rights come from that local ordinance. Separately, the local health officer can order a biting dog euthanized for rabies testing if it shows signs consistent with rabies14. A dog that harasses or kills livestock off its owner's premises may be killed by the livestock owner on the spot, or must be killed by its owner within 24 hours of notice22.

Criminal penalties. Violating a county vicious-dog ordinance is a misdemeanor18. No Montana statute creates a specific crime for a dog attack on a person. General offenses can apply when an owner's negligence is serious: negligent endangerment (up to 1 year in jail and a $1,000 fine) and, if someone dies, negligent homicide (up to 20 years and $50,000)2021. Since 2025, an owner who negligently lets a dog harm or interfere with a service animal or its handler commits a misdemeanor with a fine of up to $1,00024.

Breed rules. No Montana statute bars breed-specific local laws; the county vicious-dog statute defines "vicious" by conduct (biting or attempting to bite without provocation), not breed18.

Compare states: dangerous dog laws by state, bite quarantine rules, euthanasia after a bite. If your dog bit someone, start with what happens next.

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.

Civil claims, deadlines and insurance: Montana dog bite law. All states

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Every rule on this page is cited to the statute, regulation or court decision it comes from, and each source was opened on the date shown. We don't take payments from law firms or insurers. This is general information, not legal advice; laws change, so check the cited source or ask a lawyer licensed in the state before you rely on a deadline. Spotted an error? Tell us. Our method