Dog Laws in Missouri: Bites, Dangerous Dogs, and Licensing

Dog laws in Missouri hold owners strictly liable when their dog bites someone without provocation, leave licensing and rabies rules to cities and counties, ban local ordinances that single out specific breeds, and impose criminal penalties — up to a class D felony — on owners whose dogs bite again after a prior attack.

Strict Liability for Dog Bites

Under Section 273.036, if your dog bites someone without provocation while that person is on public property or lawfully on private property (including your own yard), you are liable for the victim’s injuries. It does not matter that the dog has never bitten anyone before. It does not matter that you took reasonable precautions. The statute also applies to property damage and to livestock killed or injured by your dog.¹

Comparative fault still applies. If a court finds the injured person 30 percent responsible for what happened, the owner’s damages drop by 30 percent.¹

On top of civil damages, Section 273.036 allows a fine of up to $1,000 against anyone found liable under the statute.² That fine is in addition to whatever the victim recovers, not instead of it. A single serious bite can produce medical bills, lost wages, and pain-and-suffering claims that climb quickly, which is why liability coverage matters for any Missouri dog owner.

Defenses That Can Limit or Defeat Liability

Missouri gives owners three main defenses.

Provocation

Both the civil strict liability statute and the criminal dangerous-dog statute require the bite to have happened “without provocation.” Evidence that the victim hit, cornered, or deliberately agitated the dog can take the case out of strict liability entirely.¹ The owner has to actually show provocation, not just suggest it.

Trespassing

Strict liability applies only when the victim is on public property or lawfully on private property. Someone bitten while trespassing falls outside the statute’s automatic protection.¹ Posted signs, locked gates, and the lack of any invitation help establish the defense.

Victim Engaged in Criminal Activity

Section 578.024 goes further in one narrow situation. If the dog attacks someone who was engaged in or attempting a crime at the time, the owner faces no criminal or civil liability under the bite statutes, and the dog cannot be ordered destroyed. Ordinary trespassing alone does not qualify as “criminal activity” for this purpose.³

Criminal Penalties for Keeping a Dangerous Dog

Section 578.024 creates a separate criminal offense — “keeping a dangerous dog” — that applies when a dog with a prior unprovoked bite bites again. Charges escalate with the severity of the second attack:³

Class B misdemeanor as the base offense: up to six months in county jail and a fine of up to $1,000.
Class A misdemeanor when the second attack causes serious injury: up to one year in jail.
Class E felony when the second attack causes serious injury and a previous attack also caused serious injury: up to four years in prison and a fine of up to $10,000.
Class D felony when the second attack kills someone.

Ignoring the first bite is where owners get into real trouble. Once the dog has a bite history, a second incident with serious injuries can produce a felony conviction.

Seizure and Destruction

When a dog with a prior unprovoked bite attacks again, or when any dog causes serious injury or death, animal control or the county sheriff must seize the animal immediately. The dog is impounded for ten business days after the owner receives written notice, then destroyed.³

Appealing a Destruction Order

The owner can file a written appeal in circuit court. Filing the appeal and notifying the seizing agency stops euthanasia while the case is pending. The court has to hold a hearing within 30 days, and it can order the owner to pay for the dog’s housing during the appeal.³

Reporting a Bite and Quarantine Rules

Any dog bite must be reported immediately to the county health department, which then reports it to the Missouri Department of Health and Senior Services. This rule applies in any county that has not adopted its own separate rabies control regulations.⁴

Once a report is filed, the state health department investigates and may order the dog quarantined, isolated, impounded, tested, vaccinated, or destroyed. The CDC recommends a 10-day observation period after a dog bites a human, even for dogs current on their rabies shots.⁵

While the investigation is open, the owner cannot sell, give away, transport, or otherwise dispose of the dog until the department releases it. Failing to report a bite, refusing to quarantine, or moving the dog is a class A misdemeanor. The owner also pays for everything tied to the incident, including testing and treating the person bitten.⁴

Licensing and Rabies Vaccination Are Local

Missouri has no single statewide statute requiring every dog owner to license the animal. Chapter 322 authorizes counties to adopt their own rabies control rules, and cities with animal control programs generally require proof of a current rabies vaccination before issuing a tag. Fees, renewal cycles, and paperwork all vary by jurisdiction.

St. Louis County, for example, charges $8 for a one-year rabies tag on a spayed or neutered dog and $16 on an unaltered dog, with three-year tags at $20 and $40.⁶ Warrensburg charges $5 for a spayed or neutered dog and $10 for an unaltered dog. The rules where you live may look different from the county next door, so check with your city hall or county animal control office.

Dogs at large without a collar can be impounded. Under Section 273.100, an impounded dog is held for one week, and the owner can reclaim it by paying any applicable tax and a redemption fee. Unclaimed dogs may then be destroyed.⁷

No Breed-Specific Bans

Missouri does not allow local governments to target specific breeds. Section 67.142 preempts breed-specific regulation statewide, making any city or county ordinance aimed at a particular breed null and void. Communities that had breed-specific ordinances on the books before August 28, 2022 had until February 28, 2024 to repeal or revise them; after that date any remaining breed-specific rules became unenforceable.⁸

Cities and counties can still pass “vicious dog” or “dangerous dog” ordinances and can regulate dogs running at large. A local government can require muzzling or extra insurance for any dog that has bitten someone. It just cannot limit that requirement to pit bulls, Rottweilers, or any other named breed.⁸

Neglect and General Impoundment

Missouri defines animal neglect as having custody or ownership of an animal and failing to provide adequate care, or knowingly abandoning an animal without arranging for its care. Adequate care means food, water, shelter, and veterinary attention when needed. A first offense is a class C misdemeanor. A subsequent offense is a class B misdemeanor, carrying up to six months in jail and a fine of up to $1,000.⁹

A court can waive the fine for a first offense if the owner puts permanent, adequate remedies in place. Costs incurred by animal control or a shelter for caring for the neglected animal cannot be waived — the owner pays those either way.⁹

For stray or at-large animals more generally, Section 578.016 sets hold periods before an animal can be adopted out or humanely destroyed:

Five business days if the owner is unknown.¹⁰
Ten business days if the owner is known, giving that owner more time to reclaim the animal.¹⁰

Service Dog Misrepresentation

Under Section 209.204, knowingly misrepresenting a pet as a service dog or assistance animal is a class C misdemeanor, plus civil liability for any actual damages caused. A second or later offense becomes a class B misdemeanor.¹¹ State law does not create a blanket licensing fee exemption for service dogs. Whether your service animal is exempt from local registration fees is up to your city or county.

1
Missouri Revisor of Statutes. Missouri Code 273-036 – Owner Liable, When, Fine, Amount
2
Missouri Revisor of Statutes. Missouri Code 273.036 – Owner Liable, When, Fine, Amount
3
Missouri Revisor of Statutes. Missouri Code 578.024 – Keeping a Dangerous Dog, Penalties
4
Missouri Revisor of Statutes. Missouri Code 322.140 – Animal Bite, Report to County Health Department
5
Centers for Disease Control and Prevention. Information for Veterinarians – Rabies
6
St. Louis County Website. Rabies Tag Information
7
Missouri Revisor of Statutes. Missouri Code 273.100 – Impounding of Dogs, Redemption, Fees, Penalty
8
Missouri House of Representatives. House Bill Nos. 1657 and 1588 – Section 67.142
9
Missouri Revisor of Statutes. Missouri Code 578.009 – Animal Neglect and Abandonment, Penalties
10
Missouri Revisor of Statutes. Missouri Code 578-016 – Impoundment of Animals
11
Missouri Revisor of Statutes. Missouri Code 209.204 – Misrepresentation of Dog as Service Dog, Penalty, Civil Liability