Defenses to a Dog-Bite Injury Lawsuit

A dog owner may raise a number of defenses when facing a lawsuit over a dog-bite injury.

Updated by , J.D. · University of San Francisco School of Law

The rules of dog owner liability for bites and other injuries vary from state to state, and so do the owner's options for avoiding legal responsibility when facing a dog-bite-related civil lawsuit.

A dog owner might be able to disprove key elements of the plaintiff's case, or argue one of the common defenses available to dog owners facing a dog-bite claim, including:

  • the injured person provoked the dog
  • the injured person was trespassing
  • no bite or actual injury occurred, and
  • the injured person assumed the risk of harm.

Defenses vs. Disproving the Plaintiff's Case

When it comes to the substance of a dog-bite lawsuit, a defendant dog owner can usually "win" (avoid liability) in one of two ways:

  • by convincing the judge or jury that the person who is suing (the plaintiff) did not prove all necessary elements of his or her case, or
  • by providing a successful affirmative defense.

In any personal injury lawsuit, including dog-bite injury claims, the plaintiff is required to prove that the defendant is liable for the incident that led to the harm. The plaintiff must present evidence that convinces the judge or jury that it is "more likely than not" (i.e. better than 50/50) that the plaintiff's version of events is true. Exactly what the plaintiff will need to prove will depend on the dog owner liability rules in place in a given state. We'll get into those details below.

A successful affirmative defense, on the other hand, allows a defendant to win the case even if the plaintiff proved all required elements. Instead of disproving the plaintiff's case by arguing that the evidence is weak (or non-existent), the defendant presents other evidence that proves an "affirmative" defense. A common example is the statute of limitations: a plaintiff with an otherwise winning case will lose if the defendant proves that the plaintiff did not start the lawsuit on time.

Disproving the Plaintiff's Case In Dog-Bite Lawsuits

The defendant's tactics for disproving the plaintiff's case will depend on the dog owner liability rules in place in the state. Most states follow either "strict liability" or "one-bite"/negligence rules.

In a state with a strict liability dog-bite statute, disproving a plaintiff's case will probably be difficult. Although the statutes vary, many "strict liability" states have a rule along these lines:

If the plaintiff was somewhere they were legally allowed to be, and if the plaintiff did nothing to provoke the dog, the dog owner is liable if the animal bit or otherwise attacked the plaintiff.

In some states, the animal must meet the definition of a "dangerous dog" in order for strict liability to apply. Other states have carved out still more requirements for when strict liability will come into play.

A defendant has few defenses in states that have a strict liability dog-bite statute, other than arguing that the plaintiff provoked the dog or was trespassing (more on these defenses later), or otherwise claiming that some key element for application of strict liability hasn't been met.

In states that don't follow "strict liability" for dog owners (or when the requirements for strict liability aren't met in a strict liability state), the dog owner might have an easier time.

In "one-bite" or negligence cases, the defendant's first option for winning often lies in convincing the judge or jury that the plaintiff's evidence is too weak to satisfy the "more likely than not" standard. If the defendant successfully does that, the plaintiff loses the case. A common example would be convincing the jury that the plaintiff's one witness didn't remember enough about the biting incident (who was where, whether the dog was provoked, etc.).

The Defendant Did Not Own/Control the Dog

The defendant can also try to convince the judge that the defendant did not owe any legal duty of care to the plaintiff under the circumstances. One way to do this is to show that the defendant did not own or was not in control of the dog at the time of the incident.

It is always up to a judge (not a jury) to determine if a duty is owed, and the facts of a case may create other unique opportunities to argue that the circumstances surrounding the bite did not give rise to any duty of care on the part of the defendant.

No Bite or Injury Occurred

No matter how aggressive a dog becomes, and regardless of how terrified the plaintiff might have been, if no actual injury occurred, there is no valid dog-bite case. Even if the dog made every attempt to bite the plaintiff, if the animal didn't succeed in making contact with the person (and there was no other physical harm, i.e. the person didn't fall to the ground), there's a critical element missing: compensable harm ("damages" in the language of the law).

The Plaintiff Was Trespassing

If the plaintiff was trespassing at the time of the bite, the owner might be able to avoid liability for the plaintiff's injuries. In most states, the dog-bite statute that's in place requires that the person who was bitten be "lawfully on the property" where the bite occurred in order for the animal owner to be liable. Learn more about homeowner liability when a dog bites a trespasser.

The Plaintiff Provoked the Dog

If the plaintiff in some way provoked the dog in the moments before the bite occurred, that might also provide an affirmative defense. Some dog-bite statutes, however, do not allow a provocation defense.

In states that do allow the defense—either by statute or through court decisions ("precedent")—it may be the plaintiff's responsibility to establish that they did not provoke the dog, either intentionally or unintentionally. The defendant can then either argue that the plaintiff failed to give convincing evidence of no provocation, or can give his or her own evidence that the plaintiff actually did provoke the dog. Learn more about provocation and dog-bite injury claims.

The Plaintiff Was Negligent or Assumed the Risk of Injury

A defendant may also be able to argue that the plaintiff contributed to the dog-bite incident or "assumed the risk" of a dog bite. A classic example might be the solicitor who sees that a barking dog is off of his chain in a yard, but attempts to enter the property anyway. Remember though, that this defense will generally not be available in a state with a strict liability dog-bite statute.

Getting Help After a Dog-Bite Incident

If you find yourself on either side of a dog-bite claim—as a dog owner or as someone who suffered a bite or other injury—it might make sense to discuss your situation with an experienced legal professional.

A personal injury lawyer will be familiar with dog owner liability rules in your state, and can put your best case together to ensure the best result. Learn more about how to find the right personal injury attorney, or use the features on this page to connect with an injury lawyer near you.

Make the Most of Your Claim
Get the compensation you deserve.
We've helped 285 clients find attorneys today.
There was a problem with the submission. Please refresh the page and try again
Full Name is required
Email is required
Please enter a valid Email
Phone Number is required
Please enter a valid Phone Number
Zip Code is required
Please add a valid Zip Code
Please enter a valid Case Description
Description is required

How It Works

  1. Briefly tell us about your case
  2. Provide your contact information
  3. Choose attorneys to contact you