The state-level rules every owner and walker in Montana should know. Local leash lengths, licensing and off-leash rules are set by each city — find those on the city pages below.
Montana's dog-bite liability changes at the city-limit sign — strict liability in town, negligence outside it.
Under MCA § 27-1-715, the owner of a dog that without provocation bites a person in a public place, or lawfully on private property, located within an incorporated city or town, is strictly liable — regardless of the dog's former viciousness or the owner's knowledge.
The geographic limit is the key feature: this strict-liability statute applies only within incorporated cities and towns. Bites outside city or town limits are handled under negligence, negligence per se, or scienter, where the victim must prove fault or prior knowledge. Montana is unusually harsh on defenses: under Stroop v. Day (1995), an owner sued under the statute cannot raise comparative negligence or most affirmative defenses — only provocation and trespass survive.
The statute covers bites only. If a dog knocks someone down, trips, or scratches them, the claim proceeds under negligence (the victim must prove the owner failed to use reasonable care). Montana's personal-injury limit is three years from the injury, whether the claim is under the bite statute or negligence.
Montana's state code authorizes counties and cities to enact ordinances on licensing, dangerous dogs, barking, running at large, and destruction of unlicensed dogs (Title 7). There is no statewide leash law — leash, licensing, and dangerous-dog rules are set by each city and county. So the city page governs the day-to-day rules; the state governs the liability standard.
Montana law allows a landowner or authorized officer to destroy a dog seen chasing, attacking, or killing livestock or hooved game animals on that land, without liability. This is ranch country and the law is serious about it — keep dogs well away from livestock and wildlife. On trails, assume wildlife (deer, and in many areas bears and mountain lions): leashed and close.
This is general information about Montana law, not legal advice. Confirm current rules with the official state and municipal sources.