If a dog bit you in Colorado and you suffered serious bodily injury, you do not have to prove the owner did anything wrong. Colorado's dog bite statute, C.R.S. 13-21-124, makes the owner strictly liable for economic damages in that situation, meaning the owner is responsible whether or not the dog had ever bitten anyone before and whether or not the owner was careless. That is the short answer. The longer answer involves what counts as serious bodily injury, what damages strict liability actually covers, several exceptions that can defeat a claim entirely, and a filing deadline that is easy to miss.
What Colorado dog bite law actually says
Colorado uses a hybrid approach. It is not a pure strict liability state, and it is not a pure one bite state either. The statute creates a narrow strict liability path and leaves ordinary negligence law in place alongside it.
Under C.R.S. 13-21-124, a person who suffers serious bodily injury or death from a dog bite may bring a claim against the dog's owner for economic damages, and the owner's knowledge of the dog's history is not part of the case. The plaintiff does not have to show the dog was vicious, that it had bitten before, or that the owner ignored warning signs. Two conditions matter: the person was lawfully on public property or lawfully on private property, and the injury rises to the level of serious bodily injury.
The reason people sometimes call Colorado a one bite state is the older common law rule, which held an owner responsible only if they knew or should have known the dog was dangerous. That rule has not disappeared. It still runs underneath the statute and matters in cases the statute does not reach.
What counts as serious bodily injury
This is the threshold question in most Colorado dog bite cases, because it decides whether strict liability is available at all. Colorado law defines serious bodily injury as an injury that involves, either at the time or at a later time, a substantial risk of death, a substantial risk of serious permanent disfigurement, a substantial risk of protracted loss or impairment of the function of any part or organ of the body, or breaks, fractures, or burns of the second or third degree.
A deep puncture wound that leaves a permanent facial scar can qualify. A bite that crushes tendons in the hand and limits grip strength for months can qualify. A shallow nip that heals in a week generally does not. Because the line is not always obvious in the first days after an attack, documenting the wound with photographs before it heals, and following through on medical care, matters a great deal.
Strict liability covers economic damages only
This is the part of the statute that surprises people most. The strict liability path in C.R.S. 13-21-124 is limited to economic damages. Those are the losses with a number attached:
- Emergency room and hospital bills
- Surgery, including reconstructive and scar revision procedures
- Follow-up care, physical therapy, and rabies prophylaxis
- Prescription medication
- Lost wages and lost earning capacity
- Out-of-pocket costs tied to the injury
Pain and suffering, emotional distress, disfigurement, and loss of enjoyment of life are noneconomic damages, and the strict liability statute does not reach them. To recover those, a plaintiff has to prove an ordinary negligence claim: that the owner failed to use reasonable care, for example by letting a dog with a known history of aggression run loose, by violating a local leash ordinance, or by ignoring a court order about a dangerous dog.
In practice, many dog bite cases are filed on both theories at once. Strict liability secures the medical bills without a fight about fault, and the negligence claim opens the door to noneconomic damages if the facts support it.
How the noneconomic damages cap fits in
When a negligence claim does reach noneconomic damages, Colorado caps them. Under C.R.S. 13-21-102.5, the cap sits at roughly $642,180, and a court may raise it to about $1,000,000 on clear and convincing evidence justifying the higher figure. These figures adjust over time, so the number that applies depends on when the claim arose.
Exceptions that can defeat a Colorado dog bite claim
The statute lists several situations where strict liability does not apply. Some of these come up often:
- Trespassing. The injured person must have been lawfully on the property. Someone who climbs a fence into a fenced yard is generally outside the statute's protection.
- Posted warning. If the property is clearly marked with a sign such as "no trespassing" or "beware of dog," strict liability may not apply to a person on that private property.
- Provocation. If the person knowingly provoked the dog, the strict liability claim can fail.
- Working dogs. Dogs working in police or military service, or lawfully engaged in hunting, herding, predator control, or similar work on the owner's property, are carved out.
- Veterinary and professional care. A person who was knowingly working with the dog professionally, such as a veterinarian, groomer, kennel worker, or dog trainer, at the time of the bite is typically outside the strict liability path.
An exception to strict liability does not necessarily end the case. A negligence claim may still exist depending on the facts, and it is evaluated separately.
Comparative fault and shared responsibility
Colorado follows modified comparative fault with a 50 percent bar. If a jury assigns the injured person some share of the fault, the award drops by that percentage. At 50 percent or more, the person recovers nothing at all.
In dog bite cases, the defense often argues the injured person contributed by teasing the dog, reaching over a fence, ignoring a growl, or entering a space they were asked to stay out of. A person found 20 percent at fault on a $100,000 verdict collects $80,000. A person found 50 percent at fault collects zero, which is why these fault arguments carry real weight even when the bite itself is not in dispute.
The deadline for filing a Colorado dog bite lawsuit
Most Colorado personal injury claims, including dog bite claims, must be filed within three years under C.R.S. 13-80-101. Miss that window and the claim is generally barred no matter how strong the underlying facts are.
Three years sounds like plenty of time, and it is one of the most common ways people lose an otherwise valid claim. Insurance negotiations stretch on, surgeries get scheduled and rescheduled, and the deadline arrives while the file still feels open. Different deadlines can apply when the injured person is a minor or when a government entity is involved, and those situations carry their own notice requirements and much shorter timelines.
The bottom line
Colorado dog bite law gives people with serious injuries a real advantage: for economic damages, the owner's knowledge of the dog is off the table entirely under C.R.S. 13-21-124. But that path is narrower than it first appears. It requires serious bodily injury, it covers only economic losses, and it comes with exceptions for trespass, provocation, posted warnings, and professional handlers. Pain and suffering requires a separate negligence claim and is subject to the cap in C.R.S. 13-21-102.5. Comparative fault can reduce or erase recovery. And the three-year deadline in C.R.S. 13-80-101 runs whether or not anyone is paying attention to it. Photographs of the wound, medical records, the animal control report, and the names of witnesses are all far easier to gather in the first weeks than in the second year.
This article is general information about Colorado law and is not legal advice. Laws change and every case is different. Talk to a licensed attorney about your situation.