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Do Small Dogs Bite More Than Big Dogs?
Some research shows small dogs may have higher rates of aggressive behavior, but that doesn’t mean every small dog is more likely to bite. Dog size, breed, fear, training, socialization, and the circumstances of an encounter can all affect bite risk. In Illinois, the dog’s size does not determine whether its owner may be liable for an injury
Three Key Reasons Why Smaller Breeds May Be More Reactive
When you think about dangerous dog bites, you probably picture a large breed, such as a pit bull or Rottweiler, because of common stereotypes. However, many researchers suggest the chance of a small dog biting you is actually higher, especially if it lacks proper training. Even tiny dogs can cause serious injuries, so you need to understand the dangers they pose.
Our Chicago dog bite injury lawyer can support your claim, whether a German Shepherd or a miniature poodle bit you. Research suggests small-dog aggression can be linked to fear, body size, breed, and other behavioral factors. Let’s examine the factors that contribute to why little dogs are more likely to exhibit aggressive behavior.
Theory 1: Fear and a Need for Self-Defense
When smaller breeds look around, they tend to see that most other dogs and humans are bigger. This may mean they find unfamiliar dogs and strangers more frightening than larger breeds.
Fear can be an important factor in aggressive behavior. The 2021 University of Helsinki study published in Scientific Reports found that small body size and fearfulness were associated with higher odds of aggressive behavior toward people.
Theory 2: Owner Behavior and “Small Dog Syndrome”
An owner’s actions can also contribute to aggression in smaller breeds, such as Jack Russell terriers or miniature schnauzers. When pets display undesirable behavior, owners may not take corrective action because they see it as cute or amusing, such as persistent barking, snapping, growling, or nipping.
This can explain how the dog may develop extreme anxiety or aggression and become less obedient. Training and socialization can therefore matter when assessing small dog aggression. For more information, see our guide to why untrained dogs bite.
Theory 3: Genetics and Breeding History
Breed and genetics may also influence canine behavior, although they do not determine how an individual dog will behave. A 2008 study in Applied Animal Behavior Science found significant differences in aggression among breeds. Dachshunds, Chihuahuas, and Jack Russell Terriers had some of the highest reported percentages of serious aggression toward humans.
The study also noted that bite statistics can be affected by the greater potential for injury from larger and more physically powerful dogs. This distinction is important when comparing bite frequency with injury severity.
What Research Says: Do Small Dogs Bite More Than Big Dogs?
Research provides some evidence that small dogs may display aggressive behavior more often, but it does not establish that every small dog has a greater likelihood of biting than every large dog.</mark> The 2021 University of Helsinki study examined 9,270 purebred dogs and found that small body size was associated with higher odds of aggressive behavior toward people. Fearfulness, age, sex, and other factors were also associated with aggression.
The 2008 study of more than 30 breeds similarly found substantial differences between breeds. Dachshunds, Chihuahuas, and Jack Russell Terriers were among the breeds with the greatest reported percentages of serious human-directed aggression, including bites or bite attempts.
These studies address aggressive behavior and reported bites or bite attempts, not a universal rule that small dogs bite more than large dogs. Individual behavior, training, environment, and the circumstances surrounding an encounter remain important.
Big Dog Bite vs Small Dog Bite: Frequency and Injury Severity
Bite frequency and injury severity are different issues. A smaller dog may have less physical capacity to cause certain types of trauma, while a bite from a larger, stronger dog can cause deeper wounds or more extensive tissue damage.
That does not make small dog bite injuries harmless. Puncture wounds can become infected, and bites involving the hands, fingers, face, or neck can require prompt medical evaluation. The seriousness of an injury depends on the wound’s location and nature, not simply the dog’s size.
Big Dog vs. Small Dog at a Glance
| Factor | Small Dogs | Large Dogs |
| Aggression tendency | Some studies associate small size with higher aggression | Varies substantially by breed and individual |
| Bite frequency | May be higher in some studies | Varies by breed and circumstances |
| Typical injury | Punctures, hand injuries, facial injuries | Can include deeper wounds and significant tissue damage |
| Reporting | Minor bites may be less likely to receive medical attention | More serious injuries may be more likely to be reported |
| Training | Should not be overlooked because of small size | Training and socialization remain important |
Why Small Dog Bites Are Underreported
Minor bites may never be reported to animal control, an insurer, or a medical provider, particularly when the victim believes the injury is insignificant. This can make comparisons based only on reported bites incomplete. A lack of reporting does not necessarily mean a small dog’s bite caused no injury.
Same Liability Laws for Both Small and Large Dogs
In Illinois, the size of the dog that attacks a person is irrelevant. Under the Animal Control Act (510 ILCS 5/), owners are strictly liable for any injuries caused by their dogs in unprovoked attacks. Although small dogs may not have as powerful bites, they are often more aggressive and more likely to bite someone when fearful.
Section 16 of the Illinois Animal Control Act, 510 ILCS 5/16, provides that when a dog, without provocation, attacks, attempts to attack, or injures a person who is peaceably in a place where the person may lawfully be, the owner is liable for civil damages for the injury proximately caused by the incident.
The statute applies based on the circumstances of the incident, rather than establishing different civil liability rules for small and large dogs. Provocation and other facts can still matter in a particular case.
There is also no “one-bite rule” in Illinois. Some states have adopted this standard, under which an owner may not be liable for the first attack if their dog has never exhibited aggressive traits.
If you are unsure whether the circumstances meet Illinois law, our guide to when a dog is considered dangerous in Illinois provides additional information.
Why Every Bite Should Be Taken Seriously, Regardless of Dog Breed
Victims should take every bite seriously. For example, even deep puncture wounds from smaller dogs can cause infections. The small size of a Chihuahua or other similar dog can also make them potentially dangerous to children, as they can easily bite a child’s face and neck.
Small Dog Bite Injuries
Small dog bite injuries can include puncture wounds, cuts, bruising, nerve damage, and infections. Bites to the hands and fingers may affect movement or sensation, while bites to a child’s face can cause visible injuries that require medical treatment. Seek prompt medical care for deep wounds, uncontrolled bleeding, signs of infection, facial injuries, or other concerning symptoms. For injuries involving nerves, see our information on dog bite nerve damage.
After an attack, seek medical attention immediately. Medical records can also document the injury’s nature and treatment if you later pursue a legal claim.
A dog bite claim may involve medical expenses, lost income, emotional distress, and other damages depending on the circumstances and applicable law.
Our lawyers have secured numerous settlements for dog bite victims in the past, including:
- $1,200,000 – Two-year-old Ethan was mauled by a relative’s Doberman, leaving severe facial scarring that required future care.
- $195,500 – Eleven-year-old Caleb was bitten by a neighbor’s dog that escaped its yard, leaving lasting leg wounds.
Attorney review recommended: Verify that both settlement examples are approved for publication and that the descriptions, amounts, names, ages, and case facts match the firm’s authorized case-results records before publication.
Can a Small Dog Bite Lead to a Legal Claim in Illinois?
Yes. A small dog’s size does not by itself prevent an injured person from pursuing a claim. Under 510 ILCS 5/16, the relevant circumstances include whether the dog attacked, attempted to attack, or injured the person without provocation while the person was peaceably in a place where they had a legal right to be.
In most personal injury cases, Illinois law provides a two-year limitations period under 735 ILCS 5/13-202, although exceptions can apply. Anyone considering a claim should evaluate the deadline based on the specific facts.
Frequently Asked Questions
Research suggests that some small dogs may show higher rates of aggressive behavior, but size alone does not determine whether a dog will bite. The 2021 University of Helsinki study found an association between small body size and aggressive behavior toward people, while breed, fearfulness, age, sex, and other factors also played a role.
Not necessarily. Canine behavior varies by breed and individual dog. Research has found differences in aggression among breeds and does not support assuming that a dog’s size alone determines whether it will be calm or aggressive.
Yes, it can be. A small dog bite can puncture the skin, introduce bacteria, damage nerves, or injure the hands, fingers, face, or other sensitive areas. Medical evaluation may be appropriate depending on the wound and symptoms.
Potentially. Illinois law does not create a separate civil liability rule based solely on the dog’s size. Section 16 of the Illinois Animal Control Act addresses attacks and injuries by dogs when its statutory requirements are met.
Contact Our Illinois Dog Bite Lawyers for a Free Consultation
If you or your child suffered a dog bite injury in Chicago or elsewhere in Illinois, our lawyers can review the circumstances and explain potential legal options. We can investigate the incident, gather evidence, assess damages, communicate with insurers, and address applicable filing deadlines. Contact us to schedule a free consultation and discuss your situation.
Legally Reviewed By
Attorney Jonathan Rosenfeld
Content legally reviewed by Jonathan Rosenfeld The information on this page has been legally reviewed by Attorney Jonathan Rosenfeld, founder and managing partner of Rosenfeld Injury Lawyers LLC. With extensive experience representing dog bite victims across Chicago, Mr. Rosenfeld is dedicated to helping injury victims hold negligent dog owners accountable and pursue the maximum compensation available under the law. His deep legal knowledge and commitment to client advocacy ensure that the information provided is accurate, reliable, and aligned with current legal standards.