Animal Experts and the Innate Aggressive Traits of Pit Bulldogs

No one can be a great thinker who does not recognize that as a thinker it is his first duty to follow his intellect to whatever conclusions it may lead. Truth gains more even by the errors of one who, with due study, and preparation, thinks for himself, than by the true opinions of those who only hold them because they do not suffer themselves to think.

John Stuart Mill, On Liberty, 1859
English economist & philosopher (1806 - 1873)

Behaviorists/veterinarians

RANDALL LOCKWOOD, PhD

Randall Lockwood, who said he has witnessed the best and worst of pit bulls, said illegal dog-fighting is perpetuating dogs that are hazards to humans and other animals. Shaped by dog-fight enthusiasts, they are "a perversion of everything normal dogs should do. What theyve created is a canine psychopath."

"Fighting dogs lie all the time. I experienced it first hand when I was investigating three pit bulls that killed a little boy in Georgia. When I went up to do an initial evaluation of the dogs behavior, the dog came up to the front of the fence, gave me a nice little tail wag and a "play bow" -- a little solicitation, a little greeting. As I got closer, he lunged for my face."

The pit bull, in its purebred or mixed form, has been responsible for most of the fatal dog attacks on humans in the last two years. In 1987, there were eight deaths from dog attacks in the country, and seven involved pit bulls. In 1986, there were 13 deaths, seven involving pit bulls. But pit bulls have been victimized by hype.

The dogs are no strangers to ordinances. A pit bull ban was passed in London in the 1400s.

These dogs can be canine crocodiles. They have a dark and bloody history.

In the United States, pets are considered property in the eyes of the law. And one of the most hotly defended rights of the individual is the right to own anything, no matter how stupid or dangerous the choice — even when what someone wants to own is a threat to them, their family, and the community around them.

FRANKLIN LOEW, dean of Tufts University School of Veterinary Medicine  

Im not aware of any other breed of animal that has ever been singled out this way. This is man biting dog.



KAREN L. OVERALL,MA VMD, PhD, DACVB and MOLLY LOVE, MSN, JAVMA Vol. 218, No. 12, June 15, 200, Dog bite to humans – demography, epidemiology, injury, and risk

"Pit bull-type dogs, although not necessarily biting more often or being inherently more aggressive than any other breed, are overrepresented in the population of dogs inflicting fatal bites and those causing serious trauma. Forty-three of 101 (42%) dog bite-related deaths reported between 1979 and 1988 involved dogs identified as pit bull-type."

"During the same period, pit bull-type dogs were responsible for more deaths than would be expected given their relative rarity at the time of that study."

HUGH WIRTH, veterinarian

RSPCA Victoria president Dr Hugh Wirth said the dogs were a menace and were not suitable as pets for anyone.

"They are time bombs waiting for the right circumstances.

"The American pit bull terrier is lethal because it was a breed that was developed purely for dog fighting, in other words killing the opposition.

"They should never have been allowed into the country. They are an absolute menace."

“The fact of life is that the community doesnt want American pit bull terriers. Theyve said it loud and clear over and over again - they want them banned.”

DOUGLAS SKINNER, DVM
Another vicious attack by not one, but four pit bulls. Dare we say anything lest we raise the ire of the breed’s apologists?

I have been in veterinary practice for 43 years and never have seen anything like the infusion of this breed. Having worked with more than 100,000 dogs of all breeds, I defy any apologist to offer up such experience.

Sure, there are sweet pits, but telling one from the bad ones, the Jekyll and Hyde ones that can be incited to violence by some catalyst, is near impossible. While most apologists fancy themselves good trainers, 95 percent of owners are clueless.

Many breeds have a history of use based on genetics; the border collie’s is herding, German short hair pointers find birds, and pits have a history of violence. With that information, it still makes sense from the “it’s how you raise your dog” crowd that any dog could be made to herd or point; I mean, it’s how you raise them, right?

A border collie herds instinctively, pointers find game birds, and a pit bull? Well, it wants to chase two girls across a field with three of its buddies and maul them.

Neuter all pit bulls, require high, double fencing, and give severe fines/incarceration of owners for such attacks. I’ve had it with pit bulls and their mixes trying to bite me during exams or scaring other pet owners. Six weeks old, three months old, you can’t trust them; you can only make excuses for them.

GRAEME SMITH, veterinarian
My views about associating a breed with dangerous behaviours were challenged over time as I saw the impact of Pit Bull attacks. Talking to owners with dogs of this breed who have themselves been turned on, it became clear that these animals are unpredictable and when they attack they can cause serious injury or death. It is very hard to give Pit Bulls the benefit of the doubt.

Avoiding the identification of dogs and their behaviours by their breed means the legislation in place can be such that allows these Pit Bulls “one free bite.” This “one free bite” can have fatal consequences.

If it looks like a Pit Bull, it is a Pit Bull.
What’s at stake is the safety of people and their own pets in the wider community, there is no room for gambling with an unpredictable animal. 


And that is so often the case. No one knows where these dogs are until they come out and cause some form of grief. My position is about protecting the public and other animals from these animals.

NICHOLAS DODMAN, BVMS, ACVB, ACVA

Rottweilers were originally bred to guard the money of peasants returning home from the city of Rottweil in Germany, so their fierceness was prized. Staffordshire bull terriers and pit bulls were programmed to deliver a full crushing bite to the noses of bulls. "Theyre locked and loaded," as Dodman puts it.

on breed profiling

But Dodman defends the practice. "The insurance companies have no ax to grind," he says. They base their decisions on actuarial statistics showing that certain breeds in certain homes are a recipe for trouble and the cause of lawsuits.

on the MA muzzling law

After a spate of attacks by pit bulls this summer, Massachusetts lawmakers passed legislation requiring the dogs to be muzzled in public. Some pit bull owners protested, but a Tufts expert says the law may be a good idea. Breeds like pit bulls and Rottweilers, says animal behavior expert Nick Dodman, are hardwired for aggression.

“Some of these dogs are as dangerous as a loaded handgun,” Dodman– director of the Animal Behavior Clinic at TuftsSchool of Veterinary Medicine – said in an interview with The Boston Globe Magazine.

Genetics play a big role.

“No doubt about it, pit bulls are genetically predisposed toward aggression,” he told the magazine. “Justas certain breeds of dogs were bred to herd, certain were bred to hunt, certain to point, and others to swim.”

While most pet owners accept that their dogs have certain genetic behavioral characteristics, there is still resistance to the idea that some dogs are more dangerous than others.

“Everybody accepts [genetic behaviors like herding or hunting] until you throw in the word ‘aggression’ and things like a full, crushing bite, which some breeds were specifically bred for in the past.”

Statistics on dog attacks reinforce the link between certain dogs and dangerous behavior.

“It’s like a scene from “Casablanca” when they say, ‘Roundup the usual suspects,’” Dodman told the Globe.“It’s always German shepherds, chow, husky, pit bull.The numbers do the talking.”

He added that pit bulls and Rottweilers alone account for more than 50 percent of the fatal dog attacks every year. Despite the danger, the owners of these dogs often fail to take proper precautions.

“A lot of owners of aggressive breeds are suffering from denial and ignorance, because no one wants to be fingered as having that kind of dog,” Dodman said.

“Genetics does play a role and people who think it doesn’t are kidding themselves,” says Dodman. “The pit bull is notorious for a very hard bite. They are always No. 1 in the lethal dog bite parade. The dog was bred for pit fighting. It was bred to never give up, to bite and hang on.”

KATHERINE HOUPT, VMD, PhD, DACVB

Says Katherine Houpt, director of the Animal Behavior Clinic at Cornell and author of Domestic Animal Behavior: "Different breeds have genetic predispositions to certain kinds of behavior, though that can be influenced by how they are raised. The pit bull is an innately aggressive breed, often owned by someone who wants an aggressive dog, so theyre going to encourage it."

“I have seen so many pit bulls taken by very nice, very dog-savvy people who did all the right things,” said Houpt. “They take them to socialization class, they take them to obedience school, they are fine for a few years, and then they kill the neighbor’s dog.”

BONNIE V. BEAVER, BS, DVM, MS, DACVB, Professor and Chief of Medicine, Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Texas A&M University

Executive Director, American College of Veterinary Behaviorists

By its origin, a pit bull is a fighting dog that takes very little stimulous to initiate aggression, and it will continue to fight regardless of what happens.

Pit bulldogs have been responsible for about 70 percent of the deaths of humans killed by dogs since 1979.

The AVMA warns veterinarians to be careful about supplying behavioural evaluations of dogs for insurance purposes.

"Its risky for veterinarians," said Dr. Beaver, explaining that there are many situations in which a dog may behave aggressively, and temperament tests cant rule out the possibility of aggression. "You dont have temperament tests that can identify all possibilities."



BENJAMIN HART, professor emeritus at the UC Davis School of Veterinary Medicine and animal behaviorist
"Its quite common for a pit bull to show no signs of aggression. People will call it a nice dog, a sweet dog, even the neighbors - and then all of a sudden something triggers the dog, and it attacks a human in a characteristic way of biting and hanging on until a lot of damage is done."

Hart said pit bulls are responsible for about 60 percent of dog attack fatalities each year, which is "way out of proportion" compared with other breeds. Pit bulls make up less than 5 percent of the American dog population.

"Its very poor policy to allow any child around a pit bull, in my mind, let alone climb on a dog.



KATHRYN HAWKINS, DVM
After seeing another dog die from a pit bull attack, I feel compelled to write. The opinion that pit bulls are "mean because of the way they are raised" is often not the case. A Both of the dogs I took care of that died were attacked unprovoked by pit bulls that were in families that raised them responsibly. Just as a retriever is bred to hunt birds -- an instinct you cant stop -- many pit bulls have a genetic tendency to attack other animals. When they do, they are extremely powerful and dont quit. I have never been bitten or growled at by a pit bull -- they are very friendly. But when the instinct to attack another animal occurs, they cause serious damage, or death. They dont bite people any more often than other breeds but when they do, its bad. The aggressiveness toward other animals and damage they do is not because of "the way they are raised" -- it is usually due to a genetic instinct not in the control of the owner.



ARTHUR HERM, veterinarian, animal control
He said he disagrees with those people who believe they can train aggressiveness out of dogs, and added he believes aggressiveness is “inherent” and “genetic” in all dogs while pit bulls “seem to have more of that.”

MICHAEL W. FOX, veterinarian, animal behaviorist

"I spent 20 years studying the behavior of dogs and its not in their nature. Man, has created a monster, If you wish...These dogs were selectively bred to fight, they have greater propensity to fight than other animals, which is brought out in training."

"They can attack people, and because the attitudes of Pit Bulls it is more likely they will attack people. The worry is the power of the dogs jaw...to bite and not let go. Its quite sufficient to crush right through a childs arm or leg."

RADCLIFFE ROBINS, DVM, Master K-9 Instructor
Temperament is primarily a function of the dogs neurological makeup.
Temperament is 100% genetic; it is inherited, and fixed at the moment of the dog’s fertilization/conception/birth. Temperament in the dog cannot be eliminated nor transformed from one type to another. It cannot change during the dog’s lifetime. It is the permanent mental/neurological characteristic of the individual dog. But there may bean overlap of different temperaments in the same dog.Environment, socialization or training can modify the expression of an individual dog’s temperament, but they cannot transform it nor eliminate it. The dog will die with the temperament with which it was born.



SHERYL BLAIR, Tufts Veterinary School symposium - Animal Aggression: Dog Bites and the Pit Bull Terrier
The injuries these dogs inflict are more serious than other breeds because they go for the deep musculature and dont release; they hold and shake.

COLLEEN HODGES, Veterinary Public Health spokeswoman
Some families think that they can raise a loving pet if they treat a pit bull like any other dog. They may not realize that the dog was bred to fight and that some of these dogs may have fighting in their genes.
They are tough, strong, tenacious. They are much more capable of inflicting serious damage, and some of them do. I would not recommend pits as a family dog.

GARY WILKES, animal behaviorist

No other breed in America is currently bred for fighting, in such great numbers as the American Pit Bull Terrier. No other breed has instinctive behaviors that are so consistently catastrophic when they occur, regardless of how rarely they happen. The reality is that every English Pointer has the ability to point a bird. Every Cattle Dog has the ability to bite the heel of a cow and every Beagle has the ability to make an obnoxious bugling noise when it scents a rabbit or sees a cat walking on the back fence. Realistically, if your English Pointer suddenly and unpredictably points at a bird in the park, nobody cares. If my Heeler nips your ankle, I’m going to take care of your injuries and probably be fined for the incident. If your Beagle bugles too much, you’ll get a ticket for a noise violation. If your Pit Bull does what it’s bred to do...well, you fill in the blank.

ALEXANDRA SEMYONOVA, animal behaviorist

You will also not prevent the dog from being what he is genetically predisposed to be. Because the inbred postures and behaviors feel good, fitting the body and brain the dog has been bred with, they are internally motivated and internally rewarded. This means that the behavior is practically impossible to extinguish by manipulating external environmental stimuli. The reward is not in the environment, but in the dog itself! As Coppinger and Coppinger (2001, p. 202) put it, “The dog gets such pleasure out of performing its motor pattern that it keeps looking for places to display it.” Some dogs get stuck in their particular inbred motor pattern.

As pointed out above, this kind of aggression has appeared in some other breeds as an unexpected and undesired anomaly – the golden retriever, the Berner Senne hund, the cocker spaniel have all had this problem.The lovers of aggressive breeds try to use these breeding accidents to prove that their aggressive breeds are just like any other dog, “see, they’re no different from the cuddly breeds.” But a cuddly breed sometimes ending up stuck with a genetic disaster does not prove that the behavior is normal canine behavior. All it proves is that the behavior is genetically determined.

"These dogs arent killers because they have the wrong owners, rather they attract the wrong owners because they are killers."  The 100 Silliest Things People say about Dogs

JOHN FAUL, animal behaviorist

Faul said they were dangerous and a threat to life. He said the pitbull was bred to be absolutely fearless and had a "hair-trigger" attack response.

"The cardinal rule is that these dogs are not pets," he said.

"The only way to keep them is in a working environment."

He said the only relationship one could have with the pitbull was one of "dominance, sub-dominance", in which the dog was reminded daily of its position.

ANDREW ROWAN, PhD, Tufts Center for Animals
"A pit bull is trained to inflict the maximum amount of damage in the shortest amount of time. Other dogs bite and hold. A Doberman or a German shepherd wont tear if you stand still. A pit bull is more likely to remove a piece of tissue. Dogs fight as a last resort under most circumstances. But a pit bull will attack without warning. If a dog shows a submissive characteristic, such as rolling over most dogs wills top their attack. A pit bull will disembowel its victim."

"A study by Dr Randall Lockwood of the US Humane Society found that pit bulls are more likely to break restraints to attack someone and that pit bulls are more likely to attack their owners, possibly as a result of owners trying to separate their dogs from victims."

Jørn Våge, Tina B Bønsdorff, Ellen Arnet, Aage Tverdal and Frode Lingaas, Differential gene expression in brain tissues of aggressive and non-aggressive dogs
The domestic dog (Canis familiaris), with its more than 400 recognised breeds [1], displays great variation in behaviour phenotypes. Favourable behaviour is important for well-being and negative traits such as aggression may ruin the owner-dog relationship and lead to relinquishment to shelters or even euthanasia of otherwise healthy dogs [2,3]. Behavioural traits result from an interaction of both genetic and environmental factors. Breed specific behavioural traits such as hunting, herding and calmness/aggression are, however, evidence of a large genetic component and specific behaviours show high heritabilities [4-8].



MICHAEL D. BREED, Ph.D., Professor, Ecology & Evolutionary Biology
Certain breeds have been selected for enhanced dominance and aggression. Pit bulls and Rottweilers currently receive the most public attention in this regard, and pit bulls have been banned in many locations because they are perceived as being dangerous. While advocates of these breeds claim that maltreatment is a more likely underlying cause of the kind of aggression leading to biting incidents (some of which involve human fatalities), in fact we know that personality is fairly unresponsive to environment. Aggressive and dominant personalities likely only remain in check because dogs owners have established themselves in a position of dominance over the animal, and other people are at risk, particularly when the owner is absent.

ALAN BECK, Sc.D

However, Alan Beck, director of the Purdue University School of Veterinary Medicine Center of the Human-Animal Bond, favors letting the breed go into extinction.

“This breed alone is a risk of serious public health factors,” Beck said. “We are keeping them alive against their own best interests.”

Beck said while he does not advocate taking dogs from current and caring owners, he does feel that it has become more of a social and political issue for people than a health one.

“If these dogs were carrying an actual disease, people would advocate euthanizing them,” Beck said. “This breed itself is not natural.”

"It has this sort of mystique that attracts a population of people. Of course, most of these dogs are never going to bite, as champions of the breed will tell you. But most people who smoke dont get cancer, but we know regulations help reduce a significant risk."

"I know youre going to get beat up for this. But they just arent good dogs to own. Thats why so many of them are relinquished to shelters. There are too many other breeds out there to take a chance on these guys."

MERRITT CLIFTON, journalist
There are very few people, if any, who have written more on behalf of dogs over the past 40-odd years than I have, or spent more time down the back alleys of the developing world observing dogs in the habitats in which normal dogs came to co-evolve with humans. But appreciation of the ecological roles of street dogs & coyotes, exposing dog-eating and puppy mills, opposition to indiscriminate lethal animal control, introduction of high-volume low-cost spay/neuter and anti-rabies vaccination, introduction of online adoption promotion, encouraging the formation of thousands of new humane societies worldwide, etc., are not to be confused with pit bull advocacy. Pit bull advocacy is not defending dogs; it is defending the serial killers of the dog world, who kill, injure, and give bad reputations to all the rest. Indeed, pit bull advocacy, because it erodes public trust in dogs and people who care about dogs, stands a good chance of superseding rabies as the single greatest threat to the health, well-being, and human appreciation of all dogs worldwide.



STANLEY COREN, PhD
"A dogs breed tells us a lot about that dogs genetic heritage and makeup. Genetics is a strong determinant of personality. In the absence of any other information, we can make a reasonable prediction about how the dog will behave based upon its breed." p 84

"When we crossbreed, we lose some of that predictability, since which genes will be passed on by each parent and how they will combine is a matter of chance. Fortunately, there is some data to suggest that we can still make predispositions without knowing much about its parentage. John Paul Scott and John L Fuller carried out a series of selective breeding experiments at the Jackson Laboratories in Bar Harbor, Maine. By happy chance, their results revealed a simple rule that seems to work. Their general conclusion was that a mixed breed dog is most likely to act like the breed that it most looks like." p 77

Dog trainers/animal control, Pit Bull breeders, owners, fanciers, experts

TARYN BLYTH, Dog Trainer

1. No one is saying that a lot of Pit Bulls can’t be “successfully” socialised with other dogs. Many socialised from puppyhood are very friendly and outgoing with other dogs. The problem arises if and when fighting behaviour is triggered. Even if the Pit Bull does not start the fight, getting into conflict with another animal will often trigger their “grab, shake and kill” response.
2. “Normal” dogs engage in “ritualised” forms of aggression when they come into conflict. This involves lots of noise, but no real damage. However, when Pit Bulls fight they engage the shake-bite/kill-bite part of the predatory sequence with often fatal or near fatal results. There is seldom time to intervene to rescue the other dog before serious damage is done.
3. When Pit Bulls engage in a fight, far from this inducing an aversive state of mind (most dogs are in a defensive, survival mode during fights), opioids and dopamine are released in their brains making them feel really good - this feeling is so pleasurable that they will often seek out this behaviour again. In the same way that a border collie is built to feel really good when herding sheep, Pit Bulls are built to feel really good when fighting.
4. Due to the opioid release during fights, Pit Bulls do not feel pain and so fight on regardless of injury - trying to stop a fight is incredibly difficult.
5. When “normal” dogs fight, they usually respond to appeasement behaviour from their “opponent” i.e. as fighting is not designed to kill, but to resolve conflict without serious harm, one dog may “give in” and display behaviour which will cause the other dog to back off. Pit Bulls do not respond to appeasement behaviour during fights as this would have been counterproductive in the fighting pits and has been bred out of them.
6. In my experience Pit Bulls have a very low reactivity threshold - this means that stimuli at low intensities which would be ignored by other dogs are often triggers for aggressive behaviour in the breed. They also have very high arousal levels - they become physiologically aroused very quickly and to extreme levels.

One of the huge problems is actually the fact that the breed is extremely friendly and when well-socialised they are usually quite tolerant and very sweet. What people don’t realise is that the danger does not lie in the fearful, defensive under-socialised Pit Bull (as is so often the case with other breeds), it lies in the dog who will be triggered not into defensive behaviour, but into a predatory/fighting behaviour which is enjoyable and carried out in a happy state of mind - therefore a happy, outgoing dog is in this case no guarantee that one will not have a problem. In fact, due to the sociable nature of the dogs and apparent easy-going temperament, Pit Bulls are often put into situations which they are not equipped to handle - this is how so many tragedies occur.

TRISH KING, Director, Behavior & Training Dept. Marin Humane Society

"There is no direct eye contact or very little direct eye contact. It is very quick and over with. Which is one reason why with pit bulls and rottweilers, we have problems. Because theyre bred to do direct eye contact and so they are off putting to other dogs and actually scary to other dogs."

The fourth undesirable characteristic - arousal or excitement - is actually the most problematic. Many bully dogs cannot seem to calm themselves down once they get excited. And once they get excited all their behaviors are exacerbated. Thus, if a dog is over-confident and has a tendency to body slam or mount, he or she will really crash into the other dog or person when hes aroused, sometimes inadvertently causing injury. He may begin to play-bite, and then bite harder and harder and harder. When you try to stop the behavior, the dog often becomes even more "aggressive." In this way, play can turn into aggression fairly quickly. Research on the brain has shown that excited play has exactly the same chemistry as extreme anger. This allows a play behavior to switch quickly into aggression. And, once the dog has become aggressive a few times, the switch is much easier.

DIANE JESSUP, pit bull expert, breeder, former ACO
"Jessup, the animal control officer in Olympia, uses two pit bulls to train police and animal control officers on surviving dogs attacks.
Unlike dogs who are nippers and rippers, her pit bulls are typically "grippers" who bite down and hang onto their victims."

Jessup believes that much of dog behavior comes from their genes. “I truly believe that a dog is about 90% genetics,” says Jessup.
on protection sports
This difference in “sheepdog versus bulldog” mentality in a trainer is best understood when training the "out!” or release command. It is common practice for those training shepherds and sheepdog types to use force such as hard leash corrections or electric shock to get the dog to release the sleeve. Sadly, I had one young man come to me because a club trainer was slugging his little Am Staff bitch in the nose, till she bled, trying to get her to release the sleeve. She would not! And of course she would not! She was a good little bulldog, hanging on for dear life, just as her bull and bear baiting ancestors of old did. She was a super little gripping dog, who took the pain she experienced as just “part of the job” once her owner set her upon the sleeve. And this is the response from well bred pit bulldogs—to ignore pain while gripping. It is, after all, what they are bred for! Give me a bulldog like her, rather than one which will allow itself to be yanked off the sleeve due to pain.



MARK KUMPF, Montgomery County, Ohio Dog Warden 

on the cost of dog fighting “We had to go back and re-engineer our housing because the dogs were able to literally pull apart the cages.”



MICHAEL BURNS, Los Angeles Animal Control Lt.
You have a dog that has aggressive tendencies enhanced through constant and incestuous breeding. If there are some recessive genes on the aggressive or psychotic side, they will make themselves manifest.

They are different. Theres an absence of the normal sounds a dog makes when it attacks. Its almost a workmanlike way they hold on in an attack. Its a persistence I havent seen in any other breed.



KURT LAPHAM, a field investigator for the West Coast Regional office of the Humane Society
Most breeds do not multiple-bite. A pit bull attack is like a shark attack: He keeps coming back.



DAVID GENDREGSKE, Clare County MI Animal Control Director
“In my opinion they appeal to the most irresponsible pet owners and to younger people,” he said. “The younger people have no jobs to support the animal, or they have to move where animals aren’t allowed and (the dogs) end up here.” Certain people like pit bulls because they are intimidating, he said. “They want to scare people. It’s an intimidation thing. They’re number one with those being incarcerated. If there’s a dog left behind (when someone is sentenced to jail or prison), it’s always a pit bull,” he said. He cited the time a pit bull got out of a car and attacked a horse. He was pulled off, but he went back and grabbed the throat. He was pulled off again

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