Written and reviewed by Josh Kohanim, Esq., California Bar No. 328609 · Reviewed
In this guide
What the dog bite statute says
The dog bite statute has four subdivisions. Subdivision (a) creates the liability. The other three take a narrow class of government working dogs back out of it.
| Subdivision | What it says | What it does to a claim |
|---|---|---|
| (a) | The owner of any dog is liable for damages suffered by any person bitten while in a public place or lawfully in a private place, including the owner's own property, regardless of the dog's former viciousness or the owner's knowledge of it | Creates liability without fault and without notice |
| (b) | The rule does not apply to an agency using a dog in military or police work, where the dog defends itself or assists in an arrest, an investigation, a warrant, or the defense of a person | Removes qualifying agency dogs from the statute |
| (c) | The (b) exception fails where the person bitten was not a party to, a participant in, or suspected of the conduct that prompted the dog's use | Puts bystanders back inside the statute |
| (d) | Subdivision (b) applies only where the agency has adopted a written policy on the necessary and appropriate use of a dog | Makes the exception depend on a document |
The full text sits on the Legislature's own site at Civil Code section 3342. Two phrases in subdivision (a) carry most of the weight. Regardless of the former viciousness of the dog is what ends the one bite argument. Lawfully in a private place, including the property of the owner of the dog is what puts an invited guest, a babysitter, and a mail carrier inside the statute while leaving a trespasser outside it.
What the jury is told
Judicial Council of California Civil Jury Instruction No. 463, in the 2025 edition of CACI, converts the statute into four findings: that the defendant owned a dog, that the dog bit the plaintiff while the plaintiff was in a public place or lawfully on private property, that the plaintiff was harmed, and that the dog was a substantial factor in causing the harm. Substantial factor is the California causation standard, and it means a factor a reasonable person would consider to have contributed to the harm.
The instruction opens with the answer to nearly every excuse an owner offers: people who own dogs can be held responsible for the harm from a dog bite, no matter how carefully they guard or restrain their dogs. A fenced yard, a locked gate, a failed leash, a dog with a clean history, none of it is a defense to subdivision (a).
CACI No. 463 also gives an optional definition of lawful presence for the jury: the plaintiff was lawfully on private property if performing any duty required by law, or on the property at the invitation, express or implied, of the owner. The instruction's authorities note that the definition of lawfully upon the private property of the owner effectively prevents trespassers from recovering under the statute (Fullerton v. Conan (1948) 87 Cal.App.2d 354, 358).
Where the one bite myth comes from
California kept the older common law theory, the judge-made rule that predates the statute, alive alongside the statute, and confusing the two is how the one bite myth survives. CACI No. 462 is the common law instruction. It requires proof that the defendant owned, kept, or controlled an animal with an unusually dangerous nature or tendency, that the defendant knew or should have known about that tendency, and that it was a substantial factor in causing harm.
| Question | CACI 463, the statute | CACI 462, the common law |
|---|---|---|
| What harm is covered | A bite | Any harm from an animal's dangerous tendency |
| Whose animal | A dog | Any animal owned, kept, or controlled |
| Owner's knowledge | Irrelevant | An element the plaintiff must prove |
| Where the plaintiff was | Public place or lawfully on private property | Not an element of the instruction |
| Typical use | The ordinary bite case | Knockdowns, chases, and animals other than dogs |
A vicious propensity, in the common law sense, is any tendency likely to cause injury under the circumstances, and it does not require a prior bite. A dog that charges the fence at people walking past has one, and the neighbors who complained are how you prove it. That evidence has no role in a section 3342 claim. Our attorneys gather it anyway, because it does work in the parallel negligence claim.
What an owner can argue back
CACI No. 463's list of authorities is the shortest reliable map of California dog bite defenses. Two general defenses survive against the statute, and one narrow occupational rule ends cases outright.
| Defense | Authority | Effect |
|---|---|---|
| Contributory or comparative negligence | Johnson v. McMahan (1998) 68 Cal.App.4th 173, 176 | Reduces the award by the plaintiff's share |
| Assumption of the risk by a veterinarian or assistant | Nelson v. Hall (1985) 165 Cal.App.3d 709, 715 | Bars the statutory claim |
| Assumption of the risk by a commercial kennel worker | Priebe v. Nelson (2006) 39 Cal.4th 1112, 1132 | Bars the statutory claim |
| Not lawfully present | Fullerton v. Conan (1948) 87 Cal.App.2d 354, 358 | Defeats an element |
| Government military or police dog | Civil Code 3342(b) to (d) | Removes the bite from the statute |
There is no provocation defense in the statute. Provocation is argued as comparative negligence, where it reduces an award rather than defeating one, and it matters separately to animal control, whose definitions apply only to unprovoked behavior. When an insurance adjuster writes that your claim fails because the dog was provoked, section 3342 says no such thing.
The owner's duty after a bite
The companion statute gets little attention and is useful. Civil Code section 3342.5(a) provides that the owner of any dog that has bitten a human being shall have the duty to take such reasonable steps as are necessary to remove any danger presented to other persons from bites by the animal. That duty attaches the moment the first bite happens, which means an owner who does nothing and whose dog bites again is in a materially worse position.
Subdivision (b) allows an action by any person, a district attorney, or a city attorney where a dog has bitten on at least two separate occasions, to determine whether the conditions of treatment or confinement have remedied the danger. Subdivision (c) does the same for a dog trained to fight, attack, or kill that has bitten and caused substantial physical injury. A court may order the animal removed or destroyed. Subdivision (d) excludes trespassers and police dogs, and subdivision (f) preserves liability under section 3342.
Where the dog bite statute stops
The statute is narrow on purpose, and the situations it misses are the ones people get wrong most often. Each can still be a case, though a different one, usually built on negligence.
- The dog did not bite. A knockdown, a chase into traffic, or a fall caused by a lunging dog is outside the statute and belongs to ordinary negligence or CACI No. 462.
- The person bitten was trespassing. Lawful presence is an element, so this is not an affirmative defense the owner has to prove. It is a gap in the claim.
- The person bitten handled the dog for a living under a contract for veterinary or kennel services, where Nelson and Priebe apply.
- A qualifying agency dog did the biting under subdivision (b), unless subdivision (c) puts you back in as a bystander or the agency has no written policy under subdivision (d).
- The defendant did not own the dog. A keeper, a walker, or a landlord can still be liable, but through negligence.
- The animal was not a dog. Cats, horses, and livestock are governed by the common law rule and by other statutes entirely.
What California dog bite law requires
California dog bite law requires four facts, and none of them concern the owner's care: someone owned the dog, the dog bit you, you were in a public place or lawfully on private property, and you were harmed. The surviving defenses are comparative fault, a narrow occupational assumption of the risk, trespass, and the government dog exception. Everything the owner wants to talk about, the fence, the training, the years without an incident, belongs to a different statute.
From here the practical questions are what the county does with the dog and who writes the check. Our guide on reporting a dog bite in Los Angeles covers the agencies and the quarantine, and who pays for a dog bite claim covers coverage and exclusions. The overview sits on our Los Angeles dog bite lawyer page, and a bite on someone else's property often overlaps a premises liability claim.