Here’s what the Dog Owners' Liability Act of Ontario means for lawyers and their clients, from strict liability to unprotected animal attack victims
Dogs might be man’s best friend, but when they bite, the law does not care how friendly they normally are. But, while Ontario’s Dog Owners’ Liability Act (DOLA) sets one of the most plaintiff-friendly liability regimes in Canadian personal injury law, it has edges that cut both ways, and a gap that leaves some attack victims with almost nothing to stand on.
What does the Dog Owners’ Liability Act impose on owners?
The answer is blunt: strict civil liability. Under s. 2(1) of the DOLA, a dog owner is liable for damages resulting from a bite or attack on a person or domestic animal.
Also, the plaintiff does not need to show the owner knew the dog was dangerous, was careless, or did anything wrong at all. This means that even if the dog owner made some precautions to prevent their dog from attacking, liability still applies.
That bar is remarkably low for plaintiffs, and correspondingly, a high one for defendants.
Who are considered owners under the Dog Owners’ Liability Act
The word “owner” under the DOLA is broader than most people expect. Apart from the dog’s the registered owner, it also includes anyone who “possesses or harbours” the dog under s. 1 of the DOLA.
“Owners” under the law would then cover the following:
- hired dog walkers
- pet sitters and foster carers
- friends or houseguests temporarily in control of a dog
- parents of minors who are looking after a dog
The Ontario Court of Appeal confirmed the full scope of this definition in Wilk v. Arbour, 2017 ONCA 21. The court held that the word “owner” in the DOLA captures any person in physical possession and control of the dog just before it bites or attacks. It does not require dominion, independent decision-making authority, or long-term responsibility.
What happens when a dog owner sues another owner
That interpretation in Wilk came back to bite a dog walker in 2025. In Nigro v. Luciano, 2025 ONSC 1362, Amanda Nigro was employed part-time by a dog walking company called Syd’s Kids to care for the spouses Lucianos’ dogs. While attempting to put booties on the dog Forrest Gump before a walk, the dog attacked her, causing serious injuries to her abdomen, left upper thigh, and both arms.
When Nigro sued the Lucianos, the Ontario Superior Court of Justice dismissed her claim. It was held that because she had physical possession and control of the dog immediately before the attack, she herself an was “owner” under the DOLA.
Such interpretation aligned with s. 2(2) of the DOLA, which states that all owners of the same dog are jointly and severally liable. This means that one owner cannot sue another co-owner.
The practical message for personal injury lawyers is clear: the first question in any dog attack file is not just who registered the dog. Rather, it is who had physical control of it in the moments before the bite.
Below is a video which also explains more about Ontario’s Dog Owners’ Liability Act:
Check out our article on “Personal injuries proceedings act: Limits, notices, and traps” to learn about the factors that lawyers and litigants should not miss in these cases.
What are the defences under the Dog Owners’ Liability Act?
DOLA’s strict liability is not absolute, since there are two defences can be set up by the defendant:
- provocation on the part of the plaintiff
- intent or act of committing a crime
We’ll discuss these defenses below.
Contributory fault or negligence as a defence
Under s. 2(3) of the DOLA, a contributory mechanism can be found. It says that courts shall reduce damages in proportion to the degree to which the plaintiff’s own fault or negligence caused or contributed to the incident.
This is where the provocation argument lives; while it is an available defence for plaintiffs, it may be difficult to prove, and it must be supported by evidence. In other words, it does not eliminate liability, but only reduces the damages.
Provocation or just a startle: how courts draw the line
The closer and harder question is distinguishing provocation from conduct that merely startles the dog. The language in s. 4(6)(3) tells courts to consider “unusual contributing circumstances tending to justify the dog’s action.”
That framing is instructive, since it sets a high bar that:
- the circumstances must be unusual, and
- they must tend to justify the response
For instance, accidentally stepping on a dog’s paw, making sudden movements, or reaching toward a dog that then bites is not the same as teasing or striking it.
For personal injury practitioners, this distinction is where quantum negotiations often turn. A client who startled a dog by stumbling near it occupies very different legal ground than one who teased or physically provoked it.
Also, the evidentiary record (e.g., photographs, witness statements, veterinary history, the sequence of events) determines which side of that line a case falls on.
Protection of persons or property as a defence
The DOLA also provides a separate, complete defence in s. 3(2). Under this provision, where a person is on the dog owner’s premises with the intent to commit or in the act of committing a criminal offence, the owner is not liable under s. 2 at all.
The exception is unless keeping the dog there was unreasonable for protection purposes. In contrast to provocation, which is only an apportionment, DOLA’s s. 3(2) is a full defense.
How are damages assessed under the Dog Owners’ Liability Act?
Based on case law, damages in Ontario dog attack cases can range from $10,000 to over $500,000, depending on the nature and severity of the injuries.
Recoverable heads of damage may include:
- medical expenses, including prolonged treatment
- lost wages and income
- pain and suffering
- scarring and disfigurement, including permanent disability
- emotional distress
- psychological harm
That last category deserves attention, since psychological injury from a dog attack is a recognised head of damage in Ontario. For personal injury lawyers, this means the file should not just close at physical recovery, given that post-traumatic stress, anxiety disorders, phobias, and other psychological sequelae are also compensable.
Dog owners should realize by now that dog bite files are not small-ticket matters. Notably, the dog owner’s home insurance policy is often the first place to look for coverage, as homeowner’s insurance commonly responds to these claims.
Here’s a video for dog owners explaining what their responsibilities are under the Dog Owners’ Liability Act:
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When does the Dog Owners’ Liability Act doesn’t apply?
This is where DOLA draws a hard line, and leaves victims stranded: the DOLA only applies to dogs. Its title, defined terms, and every operative provision are specific to dogs. As such, a person attacked by a cat, horse, livestock animal, or any exotic pet has no claim under the DOLA.
Remedies available for non-DOLA animal claims
Outside DOLA, the plaintiff falls back on common law negligence. In this framework, it is required to prove that the owner knew or ought to have known of the animal’s dangerous propensity. This is the traditional scienter rule, sometimes called the “one free bite” rule.
The threshold is also fundamentally different, and much higher. In such a case, the plaintiff must establish prior knowledge of risk, and not just that a bite occurred.
Why the exception matters to lawyers and animal owners
The result of the DOLA claims and the non-DOLA animal attacks is a two-tier system:
- victims of dog attacks get strict liability under the DOLA
- victims of attacks by other animals must prove negligence
For cases involving, say, a horse knocking a rider off in circumstances suggesting the owner knew of the animal’s temperament, or a cat attack on a child, the path to recovery is considerably harder and far less certain.
The Ontario legislature has not addressed this gap. It remains an open question whether statutory reform extending DOLA-style strict liability to other domestic animals would serve public policy, given how common cat bites and horse-related injuries are now in practice.
Dog Owners’ Liability Act: that bite always has consequences
The Dog Owners’ Liability Act of Ontario gives plaintiffs a powerful tool, but it is not without its complications. The broad definition of “owner” can strip a victim of their right to sue, while the provocation defence can reduce what they recover. Psychological injuries need to be documented and pursued. And if the animal that attacked them wasn’t a dog, they may have very little to stand on at all.
Understanding all these fault lines is what separates a well-run dog attack file from one that collapses at the early stages of the case.
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