Wisconsin Dog Bite Law

How dog bite liability works in Wisconsin

Wis. Stat. § 174.02(1)(a) says the owner of a dog "is liable for the full amount of damages caused by the dog injuring or causing injury to a person, domestic animal or property"¹. It is broader than most strict liability statutes. It is not limited to bites: a dog that knocks over a cyclist or jumps on a child is covered. And it has no place limit or listed provocation defense¹. "Owner" includes anyone who owns, harbors or keeps the dog².

The statute starts with the words "Subject to s. 895.045", so Wisconsin's comparative-negligence rule applies even though no proof of the owner's fault is needed^1,5. Courts have added two other brakes. Under Fandrey v. American Family, 2004 WI 62, a judge may deny liability on public policy grounds, as the court did when a toddler wandered into a house the family had not invited her into⁸. Under Armstrong v. Milwaukee Mutual, a kennel worker or other keeper who is in control of the dog cannot use the statute against owners who were not negligent⁹.

The statute's second step is unusual. If the owner already knew the dog had bitten someone, without provocation, hard enough to break the skin and leave permanent scarring or disfigurement, a second bite of that kind costs two times the full damages¹. The owner also faces a state forfeiture of $50 to $2,500, or $200 to $5,000 after notice of an earlier injury¹.

Because the statute reaches non-bite injuries and every keeper or harborer, the questions in Wisconsin cases are usually who counts as the owner and how fault is split, not whether the dog had a history. To see how Minnesota, Iowa, Illinois and Michigan handle the same facts, use the national table.

The Wisconsin dog bite statute

The owner is liable for the full damages when the dog injures or causes injury to a person, a domestic animal or property, subject to the comparative-negligence statute¹. If the owner knew the dog had earlier bitten a person without provocation hard enough to break the skin and cause permanent scarring or disfigurement, a second such bite makes the owner liable for twice the damages¹. "Owner" includes any person who owns, harbors or keeps a dog². The statute does not apply to a police dog injuring a crime suspect, or to a person hurt while unlawfully entering an animal facility^1,14.

• Law: Wis. Stat. § 174.02 (Liability of owner for damage caused by dog); last changed 2015 Wis. Act 112; no change from 2023 to October 2026
• Injuries covered: Any injury the dog causes (bites, knock-downs, chases)
• Where: Anywhere
• Who is liable: The owner, or a keeper or harborer
• Damages: All damages, under the ordinary rules

Other ways to prove liability

Because § 174.02 covers any injury and anyone who owns, harbors or keeps the dog, most Wisconsin dog cases are brought under the statute rather than a one-bite theory^1,2. The fight is often over who counts as an owner: a person who lets a dog live in her home for months is a harborer even when the legal owner is holding the leash (Pawlowski v. American Family, 2009 WI 105)⁷, but a property owner living elsewhere is not one merely because the dog lives on his land (Augsburger v. Homestead Mutual, 2014 WI 133)⁶. A person outside the statute can still be sued for ordinary negligence, but a landlord without control over the dog owes no such duty¹¹. Leash and running-at-large rules in chapter 174 and local ordinances add forfeitures, not a separate damages remedy².

Defenses owners raise

Other defense

Your own negligence counts. Teasing, reaching over a fence or ignoring a warning can be compared with the owner's role; your award shrinks by your share and is barred if your share is greater than the owner's^1,5. The statute itself lists no separate provocation defense, so provocation is argued as comparative negligence¹.

Other defense

Public policy can cut off liability. In Fandrey v. American Family Mutual Insurance Co., 2004 WI 62, 272 Wis. 2d 46, the Wisconsin Supreme Court held that courts may deny recovery under § 174.02 on traditional public policy grounds; a child bitten after entering a home without the owners' consent recovered nothing⁸. In Pawlowski, 2009 WI 105, the same factors did not bar a claim⁷.

Veterinarians and dog professionals

A keeper cannot use the statute. In Armstrong v. Milwaukee Mutual Insurance Co., 202 Wis. 2d 258 (1996), a kennel employee caring for a dog was its keeper and could not recover under § 174.02 from owners who were not negligent⁹. The same reasoning reaches groomers, sitters and others in control of the dog when bitten.

Police dogs

The owner of a dog used by a law enforcement agency is not liable under § 174.02 for injuries to a crime suspect while the dog is performing law enforcement functions¹.

Committing a crime

The owner or custodian of a confined animal is immune from civil liability to a person hurt while unlawfully releasing animals or entering an animal facility, unless a security device likely to cause death or great bodily harm was used¹⁴.

Shared fault

Modified comparative fault (barred at 51%) (Wis. Stat. § 895.045(1)).

Your negligence does not bar recovery if it is not greater than the negligence of the person you sue; your damages are reduced by your percentage⁵. At 51% or more you recover nothing from that defendant, and your fault is compared with each defendant separately⁵. Section 174.02 is expressly "subject to s. 895.045", so this reduces a strict-liability award too¹. When double damages apply, the court first reduces for comparative negligence and then doubles: Sprague v. Sprague, 132 Wis. 2d 68 (Ct. App. 1986)¹⁰.

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

Wisconsin dog bite statute of limitations

3 years (Wis. Stat. § 893.54(1m)(a))

A suit for personal injury must be filed within three years³. A claim for damage to property, including an injured pet, has six years¹⁹. For a city, county, school district or other local government, written notice of the circumstances is due within 120 days, an itemized claim must be presented, and suit must follow within six months after the claim is disallowed; tort damages against a local government are capped at $50,000¹².

Children. A child under 18 when bitten may sue within two years after turning 18, and this never shortens the regular three-year period, so the deadline is the later of three years from the bite or the 20th birthday⁴. The 120-day notice for claims against a local government is not extended this way¹².

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

Damages

The owner owes "the full amount of damages": medical bills, future treatment, lost wages, pain and suffering, scarring and disfigurement¹. A second skin-breaking, scarring bite after the owner knew of the first doubles the award, calculated after the comparative-fault reduction^1,10. No cap limits these damages against a private owner; claims against a local government are capped at $50,000¹². Punitive damages need proof that the defendant acted maliciously or in intentional disregard of your rights, and are capped at twice compensatory damages or $200,000, whichever is greater¹³.

Landlords and property owners

A landlord is not liable under § 174.02 just because the tenant keeps a dog. In Malone v. Fons, 217 Wis. 2d 746 (Ct. App. 1998), the court followed Gonzales v. Wilkinson: a landlord who neither owned nor kept the tenant's dog owed no duty even after an earlier incident and an unenforced no-pets rule¹¹. A property owner becomes liable only by harboring the dog, which turns on the totality of the circumstances, such as living in the same household or controlling the premises (Augsburger, 2014 WI 133)⁶.

Insurance

No Wisconsin statute limits how insurers use dog breed in homeowners or renters underwriting. Chapter 174 does not require dog owners to carry liability insurance, even after a bite². Some local ordinances regulating particular breeds impose their own conditions¹⁸.

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

Who counts as the "owner" in Wisconsin

Because liability under § 174.02 does not depend on fault, most contested cases turn on whether the person sued is an "owner", which the statute defines as anyone who owns, harbors or keeps the dog^1,2. Keeping means exercising custody, care or control; harboring means giving the dog lodging or shelter^7,9.

The Wisconsin Supreme Court has drawn the lines case by case. A homeowner who let a friend's dog live in her house for months harbored it, and remained a statutory owner even while the legal owner was walking it when it bit a passer-by (Pawlowski, 2009 WI 105)⁷. A father who owned the house where his daughter's family kept their dogs, but lived elsewhere and did not control the property, was not a harborer (Augsburger, 2014 WI 133)⁶. A kennel worker caring for a dog is its keeper, so she cannot use the statute against non-negligent owners (Armstrong, 1996)⁹. If you were bitten by a dog staying with a relative, sitter or roommate, more than one person may be liable.

Bite reports and quarantine

The Wisconsin Department of Health Services asks bite victims to notify their local health department, or local law enforcement when public health staff are unavailable, whenever a bite occurs, and to tell their physician; the biting animal should not be released or destroyed until a public health official or animal control officer is consulted¹⁶. Once an officer has reason to believe a dog or cat bit a person, state law requires a quarantine order¹⁵.

A peace officer, local health officer, humane officer or similar officer must order a dog or cat quarantined when there is reason to believe it bit a person¹⁵. An animal with a valid rabies vaccination certificate may be quarantined at the owner's home; otherwise it goes to an isolation facility within 24 hours¹⁵. It stays in strict isolation for at least 10 days, with a veterinarian examining it on the first day, the last day and one day in between¹⁵. The owner pays the costs, and refusing the order is a crime punishable by a $100 to $1,000 fine, up to 60 days in jail, or both¹⁵.

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

Questions about Wisconsin dog bite law

Is Wisconsin a one-bite state?

No. Under Wis. Stat. § 174.02 the owner is liable for the full damages the first time the dog injures someone, whether or not it had shown aggression before¹. Prior knowledge matters only for double damages: a second skin-breaking, scarring bite after the owner knew of the first doubles the award¹.

Does Wisconsin law cover injuries that are not bites?

Yes. The statute covers a dog "injuring or causing injury to" a person, so being knocked down, scratched or chased into a fall is covered¹. It also covers injuries to other dogs, livestock and property; see when a dog attacks your dog^1,2.

Can I sue my landlord or my neighbor's landlord in Wisconsin?

Usually not. A landlord who merely lets a tenant keep a dog is not its owner, keeper or harborer, and Wisconsin courts have found no negligence duty even when the landlord knew of an earlier incident¹¹. A property owner who shares the household with the dog or controls the premises can be a harborer⁶. See landlord liability.

Can I kill a dog that is attacking me in Wisconsin?

Yes, if a person is threatened with serious bodily harm and other restraining actions were tried and failed or there was no time to try them²⁰. You may kill a dog attacking your pet or livestock only on property you own or control, under the same conditions; otherwise you owe the dog's owner double damages²⁰.

Will Wisconsin put my dog down after one bite?

Not under state law. The statute allows a court-ordered killing only after two serious unprovoked injuries off the owner's property, with notice of the first¹. A dog can also be killed if it cannot be captured for quarantine, if the owner violates the quarantine order, or if it shows signs of rabies¹⁵. Local ordinances such as Milwaukee's can be stricter¹⁷.

Does it matter if the bitten person was partly at fault?

Yes. Wisconsin compares fault even under the strict liability statute: your damages are reduced by your percentage, and you recover nothing from a defendant whose fault is less than yours^1,5. Courts may also deny recovery on public policy grounds, as in Fandrey, where a child entered a house without consent⁸.

Official contacts

Sources

1. Wisconsin Statutes § 174.02, Owner's liability for damage caused by dog; penalties; court order to kill, Wisconsin State Legislature. Checked 17 October 2026.
2. Wisconsin Statutes chapter 174, Dogs (incl. § 174.001 definitions, history and annotations), Wisconsin Legislative Reference Bureau. Checked 17 October 2026.
3. Wisconsin Statutes § 893.54, Injury to the person, Wisconsin State Legislature. Checked 17 October 2026.
4. Wisconsin Statutes § 893.16, Person under disability, Wisconsin State Legislature. Checked 17 October 2026.
5. Wisconsin Statutes § 895.045, Contributory negligence, Wisconsin State Legislature. Checked 17 October 2026.
6. Augsburger v. Homestead Mutual Insurance Co., 2014 WI 133, 359 Wis. 2d 385, 856 N.W.2d 874, Wisconsin Supreme Court (via CourtListener). Checked 17 October 2026.
7. Pawlowski v. American Family Mutual Insurance Co., 2009 WI 105, 322 Wis. 2d 21, 777 N.W.2d 67, Wisconsin Supreme Court (via CourtListener). Checked 17 October 2026.
8. Fandrey v. American Family Mutual Insurance Co., 2004 WI 62, 272 Wis. 2d 46, 680 N.W.2d 345, Wisconsin Supreme Court (via CourtListener). Checked 17 October 2026.
9. Armstrong v. Milwaukee Mutual Insurance Co., 202 Wis. 2d 258, 549 N.W.2d 723 (1996), Wisconsin Supreme Court (via CourtListener). Checked 17 October 2026.
10. Sprague v. Sprague, 132 Wis. 2d 68, 389 N.W.2d 823 (Ct. App. 1986), Wisconsin Court of Appeals (via CourtListener). Checked 17 October 2026.
11. Malone v. Fons, 217 Wis. 2d 746, 580 N.W.2d 697 (Ct. App. 1998), Wisconsin Court of Appeals (via CourtListener). Checked 17 October 2026.
12. Wisconsin Statutes § 893.80, Claims against governmental bodies or officers, Wisconsin State Legislature. Checked 17 October 2026.
13. Wisconsin Statutes § 895.043, Punitive damages, Wisconsin State Legislature. Checked 17 October 2026.
14. Wisconsin Statutes § 895.57, Damage, release or theft of animals, Wisconsin State Legislature. Checked 17 October 2026.
15. Wisconsin Statutes § 95.21, Rabies control program, Wisconsin State Legislature. Checked 17 October 2026.
16. Rabies, Wisconsin Department of Health Services. Checked 17 October 2026.
17. Prohibited Animals, City of Milwaukee Department of Neighborhood Services. Checked 17 October 2026.
18. Ordinance 2015-03, Sec. 7-1-9 Pit Bulls and Other Dangerous Animals, Village of Colfax, Wisconsin. Checked 17 October 2026.
19. Wisconsin Statutes § 893.52, Action for damages for injury to property, Wisconsin State Legislature. Checked 17 October 2026.
20. Wisconsin Statutes § 174.01, Restraining action against dogs, Wisconsin State Legislature. Checked 17 October 2026.