Dog owners are usually responsible when their pets bite people or hurt them another way (such as by knocking them over or chasing them). That means that the injured person may sue the owner to seek compensation for the damages, including medical expenses. But it's not always fair to hold the owner responsible if the victim was to blame for the injury. Depending on the circumstances, dog owners (and their homeowners' insurance companies or attorneys) may fight back by arguing that the injured person:
Owners can't use all these arguments in all cases. For instance, the laws in some states don't allow certain defenses. Also, the available defenses can depend on the nature of the lawsuit. To understand how that works, it helps to know that an injured person may generally sue the dog owner based on one (or more) of the basic rules for dog-bite injuries:
The dog-bite laws in many states don't apply in certain circumstances—mostly commonly, when the injured person provoked the dog or was trespassing. Some of these statutes make the victims (rather than the owners) prove they weren't at fault. And some defenses may be available if the owner's liability is based on the one-bite rule or negligence, but not under a dog-bite statute.
Dog owners will almost surely be off the hook if the injured person clearly provoked the animal—for example, by hitting or teasing it. But what about other actions that aren't so obviously provocative? Depending on the circumstances, courts might relieve owners of liability when victims unintentionally provoke dogs by:
Toddlers are prone to hugging strange dogs, patting them hard, or playfully pulling on their tails. If the dog responds by biting the child, can the animal's owner use the provocation defense? The answer partly depends on the wording of the relevant state law and how the courts interpret it. For instance, in Massachusetts and Connecticut, the dog-bite statutes presume that an injured child younger than seven didn't provoke the dog, which means that the owner would have to prove there was provocation (Mass. Gen. Laws, ch. 140, § 155; Conn. Gen. Stat. § 22-357). Courts in some states have ruled that the provocation exception in a dog-bite statute applies even when the victim was very young (see, for example, Reed v. Bowen, 503 So.2d 1265 (Fla. App. 1986) and Toney v. Bouthillier, 631 P.2d 557 (Ariz. App. 1981)). Other courts have found that this defense doesn't apply to three-year old children, because they aren't responsible for their actions or aren't capable of provoking a dog (see Ramsey v. King, 470 N.E.2d 241 (Ohio Ct. App. 1984)) and Smith v. Sapienza, 115 A.D.2d 723 (N.Y. App. Div. 1985)).
A dog owner might be able to avoid liability by proving that the injured person knew there was a risk of injury from the dog but voluntarily took that risk anyway. For instance, an owner might not be responsible if the victim ignored a prominent "Beware of Dog" sign (Benton v. Aquarium, Inc., 489 A.2d 549 (Md. App. 1985)) or agreed to take care of the dog (Murphy v. Buonato, 696 A.2d 320 (Conn. 1997)).
This rule usually applies when dogs hurt veterinarians and other people who work with animals—like vets' assistants, groomers, pet sitters, and kennel operators—because they take the risk of dog bites and other injuries as part of the job. However, courts don't all agree whether dog owners can use the assumption-of-risk defense when they've been sued under a state's dog-bite law. Some courts have concluded that the defense isn't available when the statute doesn't include it as exception to the owner's strict liability (see, for example, Collins v. Kenealy, 492 N.W.2d 679 (Iowa 1992)) and Pulley v. Malek, 495 N.E.2d 402 (Ohio 1986)). Other courts have taken the opposite position. In California, for instance, courts have long agreed that owners are relieved from strict liability under the law when injured people have voluntarily accepted the risk of getting hurt by an animal (Nelson v. Hall, 211 Cal. Rptr. 668 (Cal. App.1985)).
Owners usually aren't liable when their dogs hurt trespassers. Here again, the rules vary depending on the state and the legal basis for the lawsuit:
The rules on what is and isn't trespassing can also be complicated. Basically, a trespasser is someone who wasn't invited on the property or doesn't have a good reason to be there. This could include sticking a hand through a fence to pet a dog (see Kenney v. Barna, 341 N.W.2d 901 (Neb. 1983)). But courts will usually find that you've given an "implied invitation" to members of the public to approach your door on common errands (like asking directions or taking surveys) unless you've warned them away with signs or locked gates. Also, mail carriers and police officers performing their official duties have a legal reason to be on private property.
Another general rule is that when it's reasonable to expect that people will come on your property—even if you didn't explicitly invite them—you'll probably be liable if your dog hurts them when they're there. This principle is particularly important when it comes to children, who are likely to wander onto neighbors' yards to play with dogs. Owners have a legal responsibility either to prevent children from coming on their property or to keep their dog from hurting the kids.
In a few states (like Iowa and Maryland), the dog-bite statutes don't apply if the victims were committing a crime. But in Ohio, that crime must be something more than a "minor misdemeanor."
States have different ways of dealing with the question of liability when dog-bite victims' own carelessness contributed to their injuries. In the majority of states that use some form of "comparative negligence" rule, the victims will receive less compensation in proportion to their share of the blame. But most of those states cut off all compensation when the injured person's share reaches 50 or 51 percent. And a few states deny any compensation to victims who contributed to their injuries, even the least bit. Depending on the state and how its courts interpret the law, comparative negligence may not apply when an injured person sues under a dog-bite statute rather than based on the owner's negligence. (For more details, see our article on when dog-bite victims are partly at fault.)
The rules on legal defenses for dog bites are complicated and can vary widely from state to state, as well as from one set of circumstances to the next. If you're facing a lawsuit over an alleged injury caused by your dog, you should strongly consider speaking with a personal injury lawyer. An attorney experienced in this area can fully explain the defenses that are available in your situation and state, and can help protect your rights. And if you've been hurt by someone else's dog and are thinking of suing the owner, a lawyer can help you prepare to counter any arguments that you were at least partly to blame.