CO Dog Bite Strict Liability Law

In some states, if a dog bites you, the owner must be proven to have known the dog was dangerous, a concept known as the "one bite rule." Colorado takes a different approach. Under C.R.S. § 13-21-124, Colorado imposes strict liability for dog bites that cause serious bodily injury or death to someone lawfully on public or private property, regardless of whether the owner knew the dog was dangerous.

If the bite happened in Denver or the surrounding metro area, our Denver dog bite lawyer page explains how strict liability, animal-control reports, insurance coverage, and scarring evidence fit together in an actual claim.

Under this statute, the owner's knowledge of the dog's history does not decide liability. The owner cannot avoid a strict liability claim by showing the dog had never bitten anyone before or seemed friendly. Strict liability under the statute covers economic damages, such as medical bills and lost wages.

But—and this is where it gets interesting—the law has specific requirements that matter for your case. Let’s break them apart.

What “Strict Liability” Actually Means for Your Case

Traditional negligence requires proof that the defendant did something wrong. Under C.R.S. § 13-21-124, there's no need to demonstrate the owner was careless or that the dog had a violent history. That makes it easier to recover economic damages such as medical expenses and lost wages. Non-economic damages, such as pain and suffering, scarring, and emotional distress, generally require a fault-based theory like negligence, negligence per se, or premises liability.

This is a meaningful advantage. In a standard negligence case, much of the dispute centers on what the owner knew and whether they used reasonable care. Under the strict liability statute, those questions fall away for the economic part of the claim.

Here’s what you do need to prove:

1. A dog bit you. Seems obvious, but the statute specifically covers bites—not knockdowns, not scratches from jumping, not being chased. Those injuries may still be compensable under general negligence, but they don’t fall under the strict liability statute.
2. The bite caused “serious bodily injury.” This is defined as injury involving a substantial risk of death, serious permanent disfigurement, or prolonged loss of function of any body part or organ. Deep lacerations, broken bones, nerve damage, and facial injuries often qualify, depending on the facts.
3. You were lawfully present. You were in a public place, or you were on the dog owner’s property with permission—explicitly or implicitly. Mail carriers, delivery drivers, invited guests, neighbors walking on a public sidewalk—all lawfully present.
4. You didn’t provoke the dog. The statute does not apply if you knowingly provoked the dog. Other exceptions include properly posted "no trespassing" or "beware of dog" signs, police and military dogs, certain dog professionals, and working dogs on their property.

The “Serious Bodily Injury” Threshold

This threshold is often the main point of dispute. If the injuries don't meet the "serious bodily injury" standard under C.R.S. § 13-21-124, the claim falls outside strict liability and must proceed under a negligence theory, which requires proving the owner's fault.

Injuries that may qualify, depending on the facts, include:

• Deep puncture wounds requiring emergency treatment
• Lacerations requiring stitches or surgical repair
• Facial injuries—especially those involving scarring
• Broken bones from the force of the attack
• Nerve damage causing numbness or loss of function
• Injuries requiring reconstructive or plastic surgery
• Infections requiring hospitalization (MRSA, sepsis)

Scarring can matter here. A bite that leaves a significant, permanent scar may qualify as "serious permanent disfigurement," depending on the facts. Whether a particular scar meets the threshold is fact-specific, so careful documentation of healing and scarring is important.

When Strict Liability Doesn’t Apply—But You Still Have a Case

What if the injury doesn't meet the "serious bodily injury" bar? What if a dog knocked someone down and broke their wrist, but didn't bite them? What if a victim was scratched badly but the wound didn't require stitches? These injuries fall outside C.R.S. § 13-21-124, but owners can still be held liable for failing to control their animals or maintain safe premises.

You may still have a claim. It just runs through general negligence or statutory negligence rather than strict liability.

Under a negligence theory, you'd need to show the owner failed to use reasonable care—didn't leash the dog, violated a local ordinance, knew the dog was aggressive, or failed to control the animal in a foreseeable situation. Many Colorado cities have leash laws, and a violation can support a "negligence per se" argument. Negligence is also the usual route to non-economic damages, such as pain and suffering, even when strict liability applies.

Denver, for example, has a leash law for public areas. If an off-leash dog injures someone in a Denver park, the ordinance violation can be important evidence of negligence.

Common Defenses

Even under strict liability, claims are often disputed. Here’s what to expect:

“You Provoked the Dog”

The statute's exception applies when the injured person knowingly provoked the dog. Whether conduct amounts to knowing provocation is fact-specific, and ordinary, innocent behavior around a dog is different from deliberately tormenting it.

“You Were Trespassing”

If you were unlawfully on the property, strict liability doesn't apply. Lawful presence includes being in a public place or on private property with express or implied permission, such as a delivery driver approaching a front door. Whether someone was lawfully present is fact-specific.

“The Injury Wasn’t Serious”

The other side may have a doctor review medical records and argue the injury doesn't meet the statutory threshold under C.R.S. § 13-21-124. This is where thorough medical documentation becomes invaluable. Comprehensive evidence includes photographs of the wound before and after treatment, detailed surgical notes, precise scar measurements, and functional assessments documenting physical limitations. Medical records showing follow-up appointments, prescribed medications, and professional opinions about permanent disfigurement or functional impairment strengthen the case substantially. Documentation should also capture psychological impacts and ongoing treatment needs, as dog bites frequently result in complications beyond visible scarring.

Comparative Fault

Colorado's modified comparative fault rule (C.R.S. § 13-21-111) can come up in dog bite cases. The other side may argue an injured person was partly responsible, for example by ignoring warning signs, reaching into a fenced yard, or approaching a visibly agitated dog. Any recovery is reduced by the injured person's percentage of fault, and a person found 50% or more at fault recovers nothing.

Who Pays? (It’s Not Always Just the Dog Owner)

Dog bite claims are typically covered by the owner's homeowner's or renter's insurance policy. Most policies include liability coverage that protects against dog bite injuries, though some insurers exclude specific breeds deemed high-risk.

But the owner isn’t always the only liable party:

• Landlords—if they allowed a known dangerous dog on the property or failed to enforce pet policies
• Property managers—same theory as landlords
• Dog walkers or pet sitters—if they failed to control the animal
• Businesses—if a dog bites you at a pet-friendly store, brewery, or restaurant that failed to maintain safe conditions

When multiple parties bear responsibility for a dog bite, more than one insurance policy may be available. A thorough investigation looks at everyone whose negligence contributed to the incident and their insurance coverage.

The Statute of Limitations

In Colorado, a personal injury claim from a dog bite generally must be filed within 2 years under the general tort statute of limitations (C.R.S. § 13-80-102(1)(a)), whether it proceeds under strict liability or negligence. Missing the deadline can end the claim.

Two years passes quickly when you are focused on medical treatment and recovery. Starting early allows time for medical documentation and a thorough investigation.

Frequently Asked Questions

Does the “one bite rule” exist in Colorado?

Not for serious bites. Under C.R.S. § 13-21-124, a dog owner is strictly liable for economic damages when a bite causes serious bodily injury or death to someone lawfully present, regardless of the dog's history. A first-time biter and a known aggressive dog are treated the same under the statute. Less serious injuries, and non-economic damages, generally proceed under negligence.

What if the dog owner has no insurance?

You can still pursue a claim directly against the dog owner, even without insurance coverage. If the owner has assets—a home, savings, or steady income—a judgment can be collected through wage garnishment, bank levies, or property liens. Your attorney can simultaneously investigate whether other parties bear legal responsibility, such as a landlord who knew about the dog's dangerous propensities, a professional dog walker, or a business where the incident occurred. These third parties often carry liability insurance that may apply. A thorough investigation can uncover hidden assets or responsible parties and their insurance coverage.

Can I sue if a dog bites my child?

Yes. Parents or guardians can file a claim on behalf of a minor child. Children are often bitten in the face, and cases involving children can include scarring and long-term emotional effects that bear on the value of the claim. The same rules under C.R.S. § 13-21-124 and negligence law apply.

What if the bite happened at a dog park?

Dog parks with posted "off-leash" rules create a more complex liability picture, but claims can still be viable. Owners still have a duty to control their animals in off-leash areas. If a bite at a dog park caused serious bodily injury to someone lawfully present, the strict liability statute may apply, and negligent supervision or failure to restrain an aggressive dog can support a negligence claim.

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Disclaimer: This blog post is for informational purposes only and does not constitute legal advice. Consult with an attorney for advice regarding your specific situation.

If you or a family member was bitten, we can review how Colorado's strict liability statute and negligence law apply to your situation in a free consultation.