Oregon Dog Bite Law

A dog bite victim in Oregon can recover compensation under a special statute and the doctrines of negligence, negligence per se, scienter, and intentional tort. The dog bite statute has an unusual limitation: it imposes strict liability only for the victim’s economic losses such as medical costs and loss of income. For full compensation, the victim has to prove negligence, violation of an animal control law like a leash law, or that the dog was known to be vicious toward humans. 

Strict liability for medical bills and other economic losses

Oregon has an atypical dog bite statute that holds dog owners strictly liable for the payment of only “economic damages.” Oregon Revised Statutes, section 31.360 subdivision (1) provides that “[f]or the purpose of establishing a claim for economic damages, as defined in ORS 31.710 (Noneconomic damages), in an action arising from an injury caused by a dog: (a) The plaintiff need not prove that the owner of the dog could foresee that the dog would cause the injury; and (b) The owner of the dog may not assert as a defense that the owner could not foresee that the dog would cause the injury.”

Section 31.710 defines “economic damages” as “objectively verifiable monetary losses including but not limited to reasonable charges necessarily incurred for medical, hospital, nursing and rehabilitative services and other health care services, burial and memorial expenses, loss of income and past and future impairment of earning capacity, reasonable and necessary expenses incurred for substitute domestic services, recurring loss to an estate, damage to reputation that is economically verifiable, reasonable and necessarily incurred costs due to loss of use of property and reasonable costs incurred for repair or for replacement of damaged property, whichever is less.”


Oregon holds dog owners responsible for their negligence if it results in a dog bite injury or an injury caused by tripping, frightening or knocking down the victim. (Westberry v. Blackwell, 282 Or 129, 133, citing Restatement (Second) of Torts, § 518.) Section 518 provides: “Except for animal trespass, one who possesses or harbors a domestic animal that he does not know or have reason to know to be abnormally dangerous, is subject to liability for harm done by the animal if, but only if, (a) he intentionally causes the animal to do the harm, or (b) he is negligent in failing to prevent the harm.” 

Medlyn v. Armstrong, 49 Or.App. 829 (Or.App. 1980), a young child was bitten in the face by a dog that had been eating. There was no evidence of provocation or of attempting to take the dog’s food away, that that the dog had ever bitten a person before this incident. However, the defendants were aware that their dog became very aggressive when around food. For that reason, the court held that the jury could properly determine that it was negligent to permit a young child to be in the vicinity of the dog when food was present. The duty to confine the animal applies when the owner has “knowledge or a basis for knowledge … that the dog will behave in a potentially injurious manner.” Kathren v. Olenik, 46 Or.App. 713, 719. In that case, the court said:

Negligence, in terms of an omission to confine or control an animal, is based on a duty to take reasonable precautions to prevent a foreseeable risk of injury by the animal. Negligent failure to control or confine a dog must be analyzed in terms of the knowledge on the part of the owner that the dog will cause the injury actually incurred by plaintiff if it is not controlled or confined. (Id.)

The Kathren court placed great reliance upon the comments to Restatement (Second) of Torts, section 518. Comment (g) states, “[i]n determining the care that the keeper of a not abnormally dangerous domestic animal is required to exercise to keep it under control, the characteristics that are normal to its class are decisive, and one who keeps the animal is required to know the characteristics.” Comment (h) adds the following:

One who keeps a domestic animal that possesses only those dangerous propensities that are normal to its class is required to know its normal habits and tendencies. He is therefore required to realize that even ordinarily gentle animals are likely to be dangerous under particular circumstances and to exercise reasonable care to prevent foreseeable harm. Thus the keeper of even a gentle bull must take into account the tendencies of bulls as a class to attack moving objects and must exercise greater precautions to keep his bull under complete control if he drives it upon a public highway. So, too, the keeper of an ordinarily gentle bitch or cat is required to know that while caring for her puppies or kittens she is likely to attack other animals and human beings.

Negligence per se for violating an animal control law

In addition to scienter and general negligence, Oregon holds that the violation of an ordinance that prohibits dogs from running at large can form the basis of a claim for negligence per se. Lange v. Minton, 303 Or. 484 (Or. 1987). An ordinance that makes it unlawful for any owner or custodian “to cause, suffer or permit an animal to run at large” implies some element of fault — knowledge, consent, willingness or negligence — on the owner’s part that the dog run free. (Id.)

The one-bite rule

If the victim cannot prove negligence or violation of an animal control law, generally the victim has to prove the elements required by the “one bite rule.” (See The One Bite Rule and Legal Rights of Dog Bite Victims in the USA. Also see Kathren v. Olenik, 46 Or.App. 713, 613 P.2d 69 (Or.App. 1980); Westberry v. Blackwell, 282 Or 129, 133, 577 P2d 75 (1978); Chance v. Ringling Bros., 257 Or 319, 478 P2d 613 (1970). “If the owner knows or should have known the dog will bite a person he is charged with a duty to prevent the biting.” Kathren, supra at p. 723. “The general rule is that the owner of a dog or other domestic animal is strictly liable for injuries caused by the animal only if the owner knows or has reason to know of the animal’s dangerous propensities.” Westberry, supra. The court in Westberry referred to the formulation of this rule in the Restatement (Second) of Torts, § 509:

“(1) A possessor of a domestic animal that he knows or has reason to know has dangerous propensities abnormal to its class, is subject to liability for harm done by the animal to another, although he has exercised the utmost care to prevent it from doing the harm.

“(2) This liability is limited to harm that results from the abnormally dangerous propensity of which the possessor knows or has reason to know.”

There is no litmus test to determine whether the owner had sufficient information to be legally responsible. “Whether a reasonable person in the exercise of ordinary care would have restrained the dog is properly a question for the jury.” Westberry, supra at p. 133. As the court said in Kathren, supra:

The question is whether in the particular case the owner saw or heard enough to put a person of ordinary prudence on notice that his animal may have a propensity toward the behavior which would result in the type of injury inflicted. Stated differently, would what was known by the owner have caused a reasonable person to anticipate the kind of behavior which resulted in the injury which occurred?

Referring to a dog as a “guard dog” was not sufficient, standing alone, for a jury to conclude that a dog owner knew his dog was vicious. Kathren, supra. Expert testimony cannot establish the requisites of the scienter cause of action, because the essence of scienter is the animal owner’s knowledge of the animal’s dangerousness or viciousness:

Plaintiff argues the opinion of the expert that Mordecai was vicious and would have been vicious for several months is sufficient to allow the jury to find that defendants should have known of the dog’s temperament. That opinion may have been evidence that the dog was in fact vicious, but it is not evidence that the defendants actually knew of the propensity or were aware of any manifestations of viciousness that would put them on notice. The burden was on plaintiff to prove the dog was vicious and that defendants knew of the dog’s propensity. Kathren, supra at p. 718.

However, in Chance v. Ringling Bros., 257 Or 319, 328 (1970), it was held that evidence of general propensity of a Boxer dog to be protective and to jump was erroneously excluded.

The requisite knowledge or scienter can be imparted to the dog owner only a short time before the attack in question. In Westberry, supra, the plaintiff’s son was bitten superficially on the hand while he was outside the dog owner’s home. Upon entering, he complained that the dog had tried to bite him. When plaintiff attempted to walk past the dog on the way to her car, the dog attacked her and severely bit her too on the hand. Plaintiff sought damages on the theories of strict liability and negligence. The court held that there was sufficient evidence of negligence because the dog owner had reason to foresee that the dog would bite the plaintiff as it had bitten her son. The court permitted the case to go forward on theories of scienter (the common law cause of action) as well as negligence. “Failure to confine or control … a domestic animal can give rise to a cause of action in negligence.” Westbury, supra.