Nature versus nurture: It’s the age-old debate, especially when applied to the question of who the most aggressive dogs are.
Any dog who endures an abusive, neglectful or life-threatening situation can become aggressive. Does that mean these are bad dogs?
However, some dog breeds were bred for centuries to become protectors and hunters, and those traits are stamped on their genes. This doesn’t mean that every animal in the breed is aggressive, but simply that the potential is there (and even in what are thought of as the least aggressive dog breeds, you’ll find some outliers).
The point is this: Any dog can be aggressive, and that’s where “nurture” comes in.
Proper training is vital when it comes to helping dogs cope with anxiety and aggression. Moreover, training ensures the safety of your dog and anyone who handles the dog.
Dangerous vs. Aggression
“Dangerous” and “aggressive” are not always comparable — at least in the statistics.
Several small dogs often display more aggressive tendencies than larger breeds, yet it’s the larger breeds that always make the “dangerous dogs” lists and have their bites tracked, sometimes skewing the statistics regarding what type of breed has the most attacks.
“Damage potential” is a term that comes up with insurance companies when these companies are deciding which dogs to place on their “dangerous dogs” list:
- Several breeds such as wolf hybrids, Rottweilers, Dobermans, pit bulls and pit bull mixes, German Shepherds, and Akitas often make the list.
- Yet Chihuahuas, dogs who can and do bite often, are nowhere to be found.
The reason for this disparity? Damage potential.
Damage potential is what an insurance company will use to evaluate a dog breed. They ask: How much damage will this dog cause to a person or property should they attack?
Obviously, a Doberman can do a lot more damage than a Chihuahua, so the Doberman makes the list.
Although this may seem unfair to Doberman fans and other large-breed lovers, it makes sense. Your Doberman may be the most sweet-tempered dog on earth, but other Dobermans may not — and they can cause massive damage.
The result of all this is that the larger breeds often get unfairly labeled as being the most aggressive dogs out there, when — in many cases — it’s dogs who barely reach their kneecaps who deserve the title of most aggressive dogs.
Why Dogs Display Aggression
The dogs who cause damage most likely do so because of their ancestry.
These dogs were bred to be workers, hunters and baiters. Aggression was deliberately encouraged to get these dogs to perform their specific task better.
Centuries later, those traits are still coded into our dogs’ DNA.
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Abuse, neglect and poor training also play a large role in how any dog of any breed responds to their environment. Any dog can become aggressive under the right conditions. (Say it louder for the people in the back, right?)
When we’re choosing a dog to adopt, history is as important as the dog’s breed:
- Dogs who were allowed to exhibit poor behavior because of their small size often become aggressive, as they see themselves as the alpha.
- Dogs who were abused become aggressive out of fear.
- Dogs who were starved often become food aggressive.
- Dogs who were not properly socialized often become aggressive to other animals.
- Lastly, people often push their dog into aggression without realizing it.
Child parenting around dogs is critical. Don’t let your child hit, punch, pull tails, ride the dog or in any way harm or make your dog uncomfortable.
It may make for a cute Facebook video when your child is face-to-face with your dog, but dogs see direct eye contact and full-front facing as a challenge. The dog will be very uncomfortable with a child getting right in their face.
If you constantly let your children treat your dog as their personal jungle gym, don’t be surprised when your dog “suddenly snaps” and bites back. Chances are your dog had been telling you all along with their body language that they were uncomfortable, afraid and unhappy.
We have the ability and the responsibility to teach our dogs appropriate behavior and response starting in puppyhood, and this can make all the difference. We can promote nurture over nature.
5 Most Aggressive Dogs by Breed
Opinions vary on which are the “most” aggressive dog breeds. In no particular order, here are 5 breeds that make almost all the lists:
1. Pit Bulls
Let’s take care of the elephant in the room first: the pit bull.
There’s a lot of debate about pit bulls, and these dogs are often in the news having injured or killed someone.
Pit bulls attack by biting their target and then shaking their head back and forth, an attack style that can instantly lead to catastrophic injuries. These are also focused dogs, and many times they can’t be persuaded to release their grip.
What the news often neglects to report is whether there was a trigger for the aggression, so it’s difficult to say why the dog attacked.
The pit bull is descended from the English bull-baiting dog, which was bred to bite and hold massive animals such as bulls or bears. These dogs were bred to be aggressive, tenacious and strong.
When bull-baiting was outlawed, breeders began crossing the bull-baiting dog with the terrier to make them quicker and more agile, which started the line of descent to the pit bull we know today.
Stepping back, we can see that the pit bull in all their various incantations today attacks the same way — bite, hold and shake — and is dogged about maintaining the grip. When we look at the ancestry, we now can understand why.
Pit bulls can make wonderful, devoted and loving pets. But it’s critical that their humans socialize, evaluate and continually train them so that, in any given situation, the dog knows how they are to behave.
In 2017, pit bulls were responsible for 74% of fatal dog bites or attacks. However, there is one big qualifier: Often, dog breeds are misidentified, especially in shelters. So some of these attacks may have been by dogs with little or no “pit bull” in them.
The next dog on our list consistently ranks as much more aggressive than the pit bull — we just rarely hear about it.
Chihuahuas are strong-willed, extremely intelligent dogs.
They are responsive to firm and positive reinforcement-based training and usually turn out to be friendly, curious and adventurous.
However, the Chihuahua can also be dominant, jealous, aggressive and untrusting. And when these traits present themselves, a Chihuahua has no problem using those tiny jaws on their target.
Chihuahuas are among the oldest dog breeds in the world and originated in Mexico, prized for their combination of small size and courage.
Chihuahuas are alphas — their intelligence demands no less. Therefore, you need to invest time in training the Chihuahua just as if they were a large-breed dog instead of allowing behaviors — like jumping up — that would not typically be allowed with larger breeds.
Many people think it’s cute when a small dog exhibits stubbornness or refusal to obey. Reimagine the Chihuahua at about 60 pounds, and it’s not so funny anymore.
So, the mentality is the same regardless of the size of the dog: Proper training is key. Don’t allow aggressive or dominant behavior, even if you find it “cute.”
3. Wolf-Dog Hybrids
A dash of common sense will tell you why these animals score high on the aggression index. Wolf-dog hybrids are just what they sound like: a combination of wolf and dog.
Wolves and dogs are interfertile, which means they can mate and produce offspring, and their offspring are known as wolf-dog hybrids (regardless of the breed of dog who mates with the wolf).
Dogs have centuries of domestication at their back, but wolves have evolved with none.When wolves reach sexual maturity, their behavior changes. In the wild, this is when they begin asserting themselves as individuals within the pack.
Wolves will challenge the pack leader to achieve a higher position in the pack. In the domesticated household, you are the pack leader, so you might see assertive or aggressive behavior where there was none before:
- Territory might become increasingly important to your wolf-dog hybrid.
- You might start seeing urination inside the house as the dog marks their territory.
- Strangers may elicit a much stronger response from the wolf-dog hybrid than previously seen.
However, mating between wolves and dogs is consistent in only one area: It produces highly inconsistent offspring, also making it one of the most unpredictable dog breeds.
Some wolf-dog hybrids are just as laid-back as you are, while others seem to be taking all their cues from The Call of the Wild. Even animals from the same litter can demonstrate wildly differing behavioral traits.
So it’s up to you to do intensive research on both dogs and wolves before bringing a wolf-dog hybrid into your home.
This is not a pet that typically does well lying around on the sofa all day. They require lots of consistent and repetitive training as well as plenty of exercise and mental stimulation.
That’s right — here’s another small pup on the list of most aggressive dogs to prove that size is no indicator of aggressive tendencies.
According to a study published in the journal Applied Animal Behaviour Science, Dachshunds rank among the most aggressive dog breeds in terms of aggression against both people and other animals.
Like the Chihuahua, this is likely because the Dachshund’s size makes it easy to overlook inappropriate behaviors such as jumping, barking and snarling.
Dachshunds originate in Germany, where they were bred to hunt badgers, small animals who are fierce fighters when cornered. The Dachshunds’ short legs allowed them to follow badgers right into their dens and fight to the death.
Today, Dachshunds still have a strong prey drive, so it’s not smart to allow them around smaller mammals.
They’re also independent, intelligent and strong-willed. They will become aggressive if you don’t train them properly or set boundaries.
5. Jack Russell Terriers
The Jack Russell Terrier makes a great pet. These dogs are intelligent, agile and fun-loving, and they were bred to hunt foxes and other small game in the mid-1800s.
But again, without a strong pack leader to set rules and boundaries, these dogs can and do demonstrate aggression toward other people and animals — and will bite.
Small dogs like the Jack Russell Terrier tend not to be as well trained as larger dogs, so they can develop “small dog syndrome” — where a small dog thinks they are head of the household and act accordingly.
In theApplied Animal Behaviour Sciencestudy, Jack Russell Terriers ranked 3rd overall in aggressive tendencies.
Most Aggressive Dogs: 6 More Dog Breeds
Other dog breeds that tend to come up repeatedly when discussing aggression are:
- German Shepherd
- Chow Chow
- Doberman Pinscher
Final Thoughts on the Most Aggressive Dogs
Training (nurture) can make a huge impact on nature.
In no way are all dogs of any breed “bad.” Many — in fact, most— small dog breeds can become aggressive due to small dog syndrome, yet we rarely hear about these breeds because they’re simply (in most cases) incapable of causing the type of damage that a German Shepherd can.
The unifying factor when it comes to aggression is training.
Training should take place from an early age, if possible. Be consistent, firm, positive and repetitive.
Training is continual — it’s never done. Continually refresh your dog’s training and socialize them as often as possible to help prevent aggression toward other animals and people. Ultimately, training can save your dog’s life.
Teach your children how to properly handle having a dog in the home, and watch your dog for body language that indicates distress, fear or discomfort.
- Dickey, Bronwen. Pit Bull: The Battle Over an American Icon. Penguin Random House. 2017.
- Coren, Stanley, PhD, DSc, FSRC. “14 Dog Breeds Blacklisted by Insurance Companies.” Psychology Today. May 27, 2014. https://www.psychologytoday.com/us/blog/canine-corner/201405/14-dog-breeds-blacklisted-insurance-companies.
- Nolen, R. Scott. “The Dangerous Dog Debate.” American Veterinary Medical Association. Nov. 1, 2017.https://www.avma.org/news/javmanews/pages/171115a.aspx.
- McCarthy, Niell. “America’s Most Dangerous Dog Breeds [Infographic].” Forbes. Sept. 13, 2018.https://www.forbes.com/sites/niallmccarthy/2018/09/13/americas-most-dangerous-dog-breeds-infographic/#165736a062f8.
- “Position Statement on Pit Bulls.” ASPCA.https://www.aspca.org/about-us/aspca-policy-and-position-statements/position-statement-pit-bulls.
- “2017 Dog Bite Fatalities.” DogsBite.org. 2017.https://www.dogsbite.org/dog-bite-statistics-fatalities-2017.php.
- Hare, Brian, and Vanessa Woods. “Pit Bulls Are Chiller Than Chihuahuas.” Atlantic. Sept. 19, 2016.https://www.theatlantic.com/science/archive/2016/09/pit-bulls-are-chiller-than-chihuahuas/500558/.
- “Wolf-Dog Hybrids.” International Wolf Center.https://www.wolf.org/wolf-info/basic-wolf-info/wolves-and-humans/wolf-dog-hybrids/.
- Duffy, Deborah L., PhD, Yuying Hsu, PhD, and James A. Serpell, PhD. “Breed Differences in Canine Aggression.” Applied Animal Behaviour Science 114, no. 3–4 (Dec. 1, 2008): 441–460. https://www.sciencedirect.com/science/article/abs/pii/S0168159108001147.
Statistics show that the highest dog attacks by breed are from Pit Bulls. Their natural aggression and high provocation rate from humans cause Pit Bulls to have the highest attack rate in the United States when compared to other dog breeds.What are the 2 most aggressive dog breed? ›
Yes – the wiener dog! The study found that “one in five dachshunds have bitten or tried to bite strangers, and a similar number have attacked other dogs; one in 12 have snapped at their owners.” Number two on the list is an even more diminutive breed – the Chihuahua, while Jack Russells came in third.Which dog is well known for its aggressiveness? ›
1. Akita. This large, Japanese breed is often used as a police or guard dog in its homeland due to its protective nature. As pets, Akitas are often wary of strangers and can make overly vigilant watch dogs.What is the most unpredictable dog breed? ›
Pit Bull Terriers
Probably the most notorious breed on this list, the pit bull has a reputation for unpredictability and aggression, even against its owner or his family. State and local governments have been vigorous in restricting ownership of this dog with breed-specific legislation.
- The Golden Retriever.
- The Labrador Retriever.
- Basset Hound.
- Bernese Mountain Dog.
- Brittany (Spaniel)
- Rough Collie.
Golden and Labrador Retrievers
Golden Retrievers and Labrador Retrievers rarely need an explanation when it comes to why they've made this list of least aggressive dog breeds. These are fun-loving, large dogs and tend to be some of the most popular breeds around the world.
Certain breeds seem more prone to suffer from rage syndrome, including Cocker and Springer Spaniels (hence the once-common terms – Spaniel rage, Cocker rage, and Springer rage), Bernese Mountain Dogs, St. Bernards, Doberman Pinschers, German Shepherds, and Lhasa Apsos.What is the most stubborn dog? ›
- #1 Akita. The 80 to 90-pound Akita is a gorgeous pooch, but it is the most stubborn, according to dog owners and experts. ...
- #2 Shiba Inu. ...
- #4 Jack Russell Terrier. ...
- #5 Beagle. ...
- #6 English Bulldog. ...
- #7 Dachshund. ...
- #8 Siberian Husky. ...
- #9 Chihuahua.
- Akita. The Akita is a muscular, double-coated dog of ancient Japanese lineage famous for their dignity… ...
- Anatolian Shepherd Dog. An Anatolian Shepherd Dog is a rugged, imposing flock guardian of ancient lineage. ...
- Appenzeller Sennenhund. ...
- Australian Shepherd. ...
- Barbado da Terceira. ...
- Beauceron. ...
- Belgian Laekenois. ...
- Bergamasco Sheepdog.
1. Border collie. According to The Intelligence of Dogs, which ranks 131 dog breeds in terms of their relative intelligence, the border collie is the smartest dog breed known to man. Need proof?
Again, most likely to be quarrelsome with other dogs are the terriers, plus the Standard Schnauzer, Australian Cattle Dog, and Chow. The most peaceful medium-size breeds are the various spaniels, Brittany, Basset Hound, Keeshond, and Vizsla.
1. Labrador Retriever. According to a spokesman from Everypaw Pet Insurance, Labrador Retrievers are very unlikely to run away as they have a strong desire to please their owners. If you're looking for a trustworthy and fun family companion that's very unlikely to leave, they're hard to beat.What is the most loved dog breed? ›
There's a new top dog in town. For the first time in 31 years, the Labrador Retriever has been unseated as the most popular dog breed in the US, according to the American Kennel Club's 2022 registration statistics. In its place sits the cute and compact French Bulldog.Which dog breed doesn t bite? ›
Labrador Retrievers, Cavalier King Charles Spaniels and Newfoundlands are among the safest dog breeds that are least likely to bite, new research has found. While any dog can nip, these breeds are known for their particularly sweet-tempered spirit as long as they are treated right.What is the largest and most gentle dog breed? ›
Clocking in at a whopping 110 to 175 pounds and 28 to 32 inches tall, the Great Dane is one of the biggest (and friendliest) dogs out there. In fact, these pups have earned the nickname “Gentle Giants” for being sweet, dependable, and patient, and are great dogs to have around young children.What dog breeds are easily stressed? ›
The dog breeds that are more likely to have this problem are the German Shepherd, Australian Shepherd, Border Collie, Jack Russell Terrier, Cavalier King Charles Spaniel, Bichon Frise, Toy Poodle, Labrador Retriever, Cocker Spaniel, and German Shorthaired Pointer.Why aren t pitbulls used as police dogs? ›
There are several reasons why Pitbull-type breeds are not commonly seen as police dogs. To begin with, Pitbull-type dogs are often extremely friendly, even towards strangers. Aggression towards humans is highly uncharacteristic of the breed. Secondly, Pitbulls have a high prey drive.Why do cops use German shepherds and not pitbulls? ›
German Shepherds were naturally bred to work. German Shepherds are typically intelligent (one of the world's most smart breeds), they quick to train, obedient and loyal, athletic and healthy, and even-tempered. All of these traits make German Shepherd's ideal candidates for police work.How do you get a pitbull to release its bite? ›
95% of the dogs will release a bite grip when flipped on the back. It is very important that this is done correctly so that the action is safe and effective. Firmly grab one back leg with your opposite hand, while positioning the other hand on his croup.