Bull Breeds in Britain: From the Butcher’s Dog to the Modern Bully

Few groups of dogs generate as much debate, affection, fear and misunderstanding as the bull breeds. In Britain, the Staffordshire Bull Terrier has been a much-loved family dog for generations. The Bulldog has become something of a national symbol. French Bulldogs are now seen everywhere from city centres to country villages, while Bull Terriers, Bullmastiffs, Boxers and American Bulldogs all have their own devoted following.

More recently, we have seen the emergence of newer types including the Old Tyme Bulldog and the American Bully, with Pocket, Standard, Classic and XL varieties. The rapid rise of the XL Bully in particular has brought bull breeds back into the spotlight following a number of serious attacks and the subsequent introduction of breed-specific legislation across the UK.

Unfortunately, conversations about these dogs often fall into one of two camps. At one extreme, bull breeds are portrayed as inherently dangerous because of their ancestry. At the other, people insist that breed and genetics have absolutely nothing to do with behaviour and that a dog is entirely a product of how it is raised.

Neither position gives us a particularly useful understanding of dogs. Genetics matter. Environment matters. Training matters. Early development matters. Health matters. And the individual dog matters.

If we really want to understand bull breeds, we need to understand why their ancestors were created, the jobs humans selected them to perform and how those dogs eventually separated into the very different breeds and types we have today. A Staffordshire Bull Terrier, French Bulldog, Bullmastiff and XL Bully may all sit somewhere underneath the broad “bull breed” umbrella, but they are not simply different-sized versions of the same dog.

Before the Bulldog: The Butcher’s Dog

Long before The Kennel Club existed and dogs were divided neatly into pedigree breeds, dogs were often identified by the jobs they performed. One of those working types was the butcher’s dog.

Butchers, cattle dealers and farmers needed strong, courageous dogs capable of helping move and control livestock. Handling cattle without modern pens, races and handling systems could be extremely dangerous, particularly when dealing with bulls and semi-wild cattle. Historical references describe dogs that would help control these animals by gripping and holding them, often around the muzzle or nose.

It is important to understand that “butcher’s dog” was not one single breed. It was a job. Different countries developed their own versions. The Rottweiler, for example, became known as the Rottweiler Metzgerhund  (the Rottweil Butcher’s Dog) because cattle dealers used these powerful dogs to manage livestock. Britain developed its own mastiff, bandog and bulldog-type dogs.

To perform this type of work successfully, a dog needed physical strength, courage, persistence and the confidence to confront an animal many times its own size. Humans deliberately selected those characteristics, and unfortunately, people soon found another use for them.

From Cattle Dogs to Bull Baiting

Bull baiting became an established form of entertainment in Britain. Dogs were set upon a tethered bull and expected to seize and hold it, usually around the muzzle or nose. It was extraordinarily cruel for both the bull and the dogs, many of which were badly injured or killed.

The dogs needed to be physically capable of approaching an animal many times their own weight, avoiding being tossed or trampled and maintaining a grip under enormous pressure. Again, selective breeding mattered. The successful dogs were bred from, so humans were selecting not just for physical shape, but for behaviour too. Persistence, physical confidence, determination and a willingness to engage another animal all mattered.

Bull baiting was finally made illegal in Britain in 1835, but banning bull baiting did not immediately end blood sports. Dog fighting and ratting required considerably less space and were much easier to hide. This created the next significant development in the bull-breed story.

The Bull-and-Terrier

Bulldog-type dogs began to be crossed with terriers. The aim was to combine some of the Bulldog’s strength and determination with the agility, speed, prey drive and tenacity of the terrier.

Terriers themselves had been selectively bred for generations to hunt and kill vermin. They needed quick reactions, persistence and a willingness to pursue quarry into difficult situations. The resulting dogs became known broadly as bull-and-terriers.

Again, these were not originally uniform pedigree breeds. They were working types. From these populations eventually emerged some of the breeds we recognise today, particularly the Staffordshire Bull Terrier and Bull Terrier in Britain.

Related British and Irish bull-and-terrier dogs travelled to America, where they contributed to the development of the American Pit Bull Terrier and American Staffordshire Terrier. Much later, those American dogs would contribute to the development of the modern American Bully.

Although these breeds share pieces of ancestry, their histories began to diverge as breeders selected them for different purposes, and that matters enormously when we discuss their behaviour today.

The Staffordshire Bull Terrier: Britain’s Bull-and-Terrier

For many British people, the Staffordshire Bull Terrier — or Staffie — is the bull breed. The breed developed particularly around the Black Country, Staffordshire and northern parts of Birmingham, and it has genuine blood-sport ancestry.

We should not need to hide that in order to defend the breed. What matters is understanding what happened subsequently. For many generations, Staffords have increasingly been selected as companion dogs, and human sociability is one of the characteristics for which the breed has become renowned.

Many Staffords are tremendously affectionate towards people. They can be physical, enthusiastic and enormously people-focused, often wanting to be involved in everything their family is doing. That does not mean, however, that the frequently repeated claim that Staffords are “nanny dogs” should be taken literally. No breed is genetically programmed to babysit children, and no child should be allowed to climb over, hug, disturb or torment a dog simply because somebody has said the breed is good with children.

Their feelings about other dogs can be considerably more variable. Some Staffords live happily with other dogs throughout their lives, while others become more selective as they reach adolescence and social maturity. This brings us to one of the most important things to understand about bull breeds: human sociability and dog sociability are not the same thing.

A Stafford does not have to want to play with every strange dog in order to be a good dog. Being able to calmly walk past another dog may be a much more useful goal.

The Bull Terrier

The Bull Terrier shares those broad bull-and-terrier beginnings but developed along its own path. The modern breed descended from Bulldog and White English Terrier ancestry, with Birmingham breeder James Hinks playing an important role in stabilising the type during the nineteenth century.

Today’s Bull Terrier is unmistakable, and behaviourally they can be wonderfully entertaining dogs. They are often described as clowns because they can be affectionate, playful, ridiculous and hugely charismatic.

Underneath that comedy, however, there is still a powerful terrier. Bull Terriers can be physical, persistent and enormously determined once something has captured their attention. That makes early training particularly valuable. Recall, lead manners, disengagement, a reliable leave, frustration tolerance and the ability to settle should begin while the Bull Terrier is still a manageable puppy.

The Miniature Bull Terrier shares many of the same qualities. Again, small does not necessarily mean easy. You can reduce the size of the dog without removing the terrier inside it.

The British Bulldog

Few breeds are more closely associated with Britain than the Bulldog. Yet the modern Bulldog is a very different animal from the athletic dogs once expected to work cattle or confront bulls.

When bull baiting was outlawed, the Bulldog effectively lost its original purpose. Enthusiasts subsequently preserved it as a companion and show breed, and generations of selective breeding changed both its temperament and its body.

Today’s Bulldog is generally far removed behaviourally from the blood-sport dogs of the past. Many are affectionate, funny and comparatively low-drive companion dogs. Physically, however, selection has also created concerns. The modern Bulldog has become shorter, heavier and considerably more brachycephalic than its working ancestors, which can affect breathing, exercise tolerance, mobility and the ability to regulate body temperature.

This is another important part of the bull-breed story. Selective breeding does not only influence behaviour. It can completely reshape the body of a dog too.

And perhaps no breed demonstrates that more clearly than the French Bulldog.

The French Bulldog: Small Dog, Full-Sized Bull Breed

The French Bulldog deserves an important place in this story because people often forget that underneath its small body and enormous ears is still a bull breed.

Interestingly, the Frenchie has significant British ancestry. During the nineteenth century, small Toy Bulldogs were popular in parts of Britain. When lace workers from Nottingham moved to northern France during the Industrial Revolution, some took these dogs with them. The dogs became increasingly popular in France, further breeding took place, and eventually a distinct French Bulldog emerged.

Today we tend to think of Frenchies as companion dogs, and they certainly are. But small body does not mean small personality. Many French Bulldogs are confident, physical, determined and incredibly playful. They can love tug, chase toys, wrestle, become intensely excited and display considerably more drive than people expect when they purchase what looks like a small lapdog.

A French Bulldog may weigh a fraction of a Bullmastiff, but it still has the drive and behavioural needs of a real dog. They need training, boundaries, enrichment, socialisation, appropriate outlets and the ability to settle.

Selective breeding for exaggerated features has created serious health problems in many French Bulldogs, particularly because increasingly flat faces, shortened muzzles, broad heads and compact bodies can compromise normal function. Brachycephalic Obstructive Airway Syndrome (BOAS) can make breathing, sleeping, eating, exercising and coping with warm weather difficult, and signs such as constant noisy breathing should not be dismissed as simply “normal for the breed”. French Bulldogs are also at increased risk of dystocia, meaning natural birth can be difficult and caesarean sections are common, while allergic skin disease, facial-fold infections and chronic ear problems can lead to lifelong discomfort and veterinary treatment. If we genuinely care about the future of the breed, these problems should not be accepted as inevitable; breeders should be selecting for dogs that can breathe, move, reproduce and live comfortably.

French Bulldogs may be small, but they still need the same training foundations as larger dogs. Behaviours such as charging towards dogs, jumping up, pulling, ignoring recall, demand barking or becoming possessive can easily become established if they are excused simply because the dog is little. Frenchies should still learn recall, loose lead walking, calm greetings, leave, drop, stay, handling and frustration tolerance, while enrichment such as scent work, short training sessions, tug and problem-solving games can meet their mental needs without overloading them physically. Small bull breeds can still have plenty of drive, and they should be raised as capable dogs rather than treated as accessories.

The Old Tyme Bulldog: Trying to Turn the Clock Back

The health concerns surrounding the modern Bulldog are partly responsible for interest in dogs such as the Old Tyme Bulldog, sometimes written Olde Tyme Bulldog.

Rather than being an ancient breed that has somehow survived unchanged for centuries, the Old Tyme Bulldog is a relatively modern attempt to produce a dog that resembles the taller, more athletic Bulldog types of the past.

The idea is attractive: keep the recognisable Bulldog character but reduce some of the exaggeration. More muzzle, more leg, greater athleticism and a body capable of functioning more normally.

However, there is an important consideration for puppy buyers. The Old Tyme Bulldog is not currently recognised as a pedigree breed by The Royal Kennel Club, and dogs sold under that name can therefore come from different breeding programmes with considerable variation in ancestry, structure and temperament.

The Dorset Old Tyme Bulldogge is one particular British line developed with the intention of creating a more athletic Bulldog reminiscent of historical working types. But no breeder has literally resurrected an extinct Tudor Bulldog. Modern dogs have been selectively bred to create a representation of an older type.

That means buyers need to look beyond the label. Meet the mother. Ideally meet the father. Look at adult relatives. Ask what breeds are actually behind the line. Ask about respiratory health, hips and elbows, skin disease and temperament.

Depending on the ancestry being used, some Old Tyme Bulldogs may have considerably more athleticism, drive, guarding tendency or dog selectivity than someone expecting a slightly taller British Bulldog anticipated. I would therefore raise one as a capable, powerful dog, rather than assume it is simply a couch potato with longer legs.

The Bullmastiff: The Gamekeeper’s Dog

The Bullmastiff is a perfect example of why “bull breed” does not mean one behavioural type. A Bullmastiff is not a giant Stafford. The breed was developed in nineteenth-century Britain from Bulldog and Mastiff ancestry to assist gamekeepers protecting estates from poachers. The aim was to combine size and strength with enough courage and athleticism to pursue and apprehend an intruder.

That selection produces a very different behavioural heritage from a fighting terrier. Bullmastiffs often have considerably more guardian instinct. A good Bullmastiff can be calm and deeply affectionate with its own family while taking more notice of unfamiliar people entering its environment. Socialisation therefore should not necessarily mean making every stranger cuddle the puppy. I want that puppy to learn that people can walk past the property, delivery drivers can approach the door, visitors can come inside and strangers can pass us on a walk without the dog feeling that it needs to deal with any of them.

That is confident neutrality, and with a dog that may eventually weigh 50kg or more, those lessons become extremely valuable.

The Boxer and the Bullenbeisser

The Boxer sits slightly outside the traditional British bull-and-terrier story but shares part of the wider history of powerful holding dogs. One of its important ancestors was the German Bullenbeisser, literally “bull-biter”, which was used to hunt large game. The modern Boxer developed following crosses involving these dogs and Bulldogs.

Modern Boxers are often tremendously people-focused and playful. Their biggest challenge is not necessarily aggression. It is enthusiasm. A young Boxer can resemble a 30kg spring-loaded missile, jumping, pawing, bouncing and body-slamming through life with very little concept of personal space. Early training should therefore concentrate heavily on four paws on the floor, lead manners, recall, frustration tolerance and, perhaps most importantly, an off switch.

The American Bulldog

The American Bulldog represents another branch of old Bulldog history. Working Bulldog-type dogs survived in parts of America where farmers continued using them for livestock control, catch work, property protection and general farm duties.

Different lines developed, including heavier Johnson-type dogs and more athletic Scott-type dogs. Again, this is not simply a giant Stafford. There is significant catch-dog and guardian heritage behind the breed.

American Bulldogs can be tremendously affectionate and devoted towards their families while being naturally more reserved or suspicious around unfamiliar people and animals. Good breeding should produce confidence and stability rather than indiscriminate aggression, but owners still need to understand what may be sitting underneath the surface.

Visitor routines, recall, lead control, boundaries and calm exposure to unfamiliar people are particularly important.

The American Pit Bull Terrier

British and Irish bull-and-terrier dogs were taken to America, where they eventually contributed to the development of the American Pit Bull Terrier, or APBT. These dogs continued to be used in dog fighting but also performed other jobs including farm work, livestock handling, hunting and catch work. Traditional APBTs are generally much more athletic and moderate in build than the enormously heavy bully dogs sometimes incorrectly described as “pit bulls” today.

They also demonstrate particularly clearly why human aggression and dog aggression should never simply be lumped into one behavioural category. A dog may be extremely affectionate towards people while being selective or confrontational around dogs. Those are different characteristics.

For British owners, however, there is another crucial distinction. Pit Bull Terrier type is prohibited under the Dangerous Dogs Act 1991. UK law concerns type, not simply whatever breed name is written on a registration certificate, so calling a dog something different does not necessarily change its legal status.

The American Staffordshire Terrier

The American Staffordshire Terrier shares very close ancestry with the American Pit Bull Terrier. Over time, sections of the American bull-and-terrier population were increasingly bred for conformation and companionship, producing a more uniform show population that became the American Staffordshire Terrier.

The two populations share considerable history, even though different breeding priorities have gradually altered appearance and temperament within different lines.

Again, UK owners should understand that an overseas pedigree saying “American Staffordshire Terrier” does not automatically determine how a dog would be regarded under British prohibited-type legislation. The physical dog matters.

The American Bully: A Modern Bull Breed

The American Bully is much newer. It developed from American Pit Bull Terrier and American Staffordshire Terrier-type stock alongside influence from various Bulldog breeds, with breeding increasingly directed towards producing a muscular companion dog rather than maintaining the traditional athletic fighting or working type.

That distinction is important. The American Bully should not simply be described as another name for an American Pit Bull Terrier. The ancestry overlaps, but the breeding direction changed.

Within the American Bully population, several varieties emerged, including Pocket, Standard, Classic and XL. These dogs can look remarkably different while still belonging to the same wider breed population.

The Pocket Bully

At the smaller end of the spectrum is the Pocket American Bully.

The name can be misleading because this is not necessarily a tiny dog. Pocket Bullies should still retain the substantial bone, broad head, muscular body and powerful appearance of an American Bully. Essentially, you have a lot of bull breed sitting relatively close to the ground. Just like the Frenchie and Miniature Bull Terrier, shorter does not automatically mean easier. Pocket Bullies can still be immensely strong, physical, excitable, persistent and very confident. Their intended temperament is primarily that of a companion dog, but a written breed standard tells us what responsible breeders should be aiming for. It cannot guarantee the temperament of every puppy being sold under the name.

Names such as Micro Bully, Nano Bully and Exotic Bully are also increasingly used within some sections of bully breeding. These should not automatically be treated as interchangeable with the recognised Pocket American Bully variety. Where breeding becomes focused on producing ever shorter legs, enormous heads, very short muzzles, excessively wide bodies or increasingly unusual features, welfare must become part of the conversation.

At some point, we need to ask whether we are breeding a functional animal or simply manufacturing a shape. A dog should still be able to breathe normally, walk normally, run, play, reproduce and live comfortably. Function should never become secondary to fashion.

Is the Pocket Bully Banned in Britain?

A genuine Pocket American Bully is not automatically an XL Bully simply because they both belong to the wider American Bully population. The Pocket variety is substantially shorter than the minimum height contained within the UK Government’s XL Bully definition. However, breeders cannot simply rename dogs to avoid legislation.

If there is genuine doubt about a dog’s legal classification, professional and legal advice should be sought rather than relying on a breeder’s paperwork or somebody’s opinion on Facebook.

The XL Bully

At the other end of the American Bully spectrum is the dog that has transformed the bull-breed debate in Britain: the XL Bully. The XL Bully is not simply another name for the traditional American Pit Bull Terrier. It is a larger variety within the wider American Bully population.

The population expanded very rapidly in Britain, and breeding quality was not uniform. Some breeders undoubtedly prioritised health, temperament and structure. Others appeared far more interested in producing enormous dogs, massive heads, extreme muscle, fashionable colours and commercially valuable bloodlines. That is a problem whenever dogs become status symbols.

When somebody tells me their XL Bully is incredibly affectionate, I have absolutely no difficulty believing them. Many are. But acknowledging lovely individual dogs does not require us to pretend genetics, breeding and physical power are irrelevant.

An extremely powerful dog requires an extremely stable temperament, and if behavioural problems do occur, the potential consequences are greater when the dog weighs 50kg than when it weighs 5kg.

That is not prejudice. It is physics.

As of August 2026, XL Bully dogs are prohibited types throughout the UK, although the restrictions came into force at different times in the different nations. In England and Wales, it is an offence to possess an XL Bully without a valid Certificate of Exemption. It is also illegal to breed from, sell, give away or abandon one, and exempt dogs must be kept on a lead and muzzled in public.

Similar restrictions apply in Scotland and Northern Ireland. The legal definition is based on physical conformation rather than a DNA test, which is why owners cannot rely solely on what a breeder or registration document calls the dog.

So Which Bull Breed Is Which?

This is where the history becomes particularly useful. The Staffordshire Bull Terrier comes through Britain’s bull-and-terrier history and has subsequently undergone many generations of selection as a companion. The Bull Terrier shares bull-and-terrier ancestry but developed as its own distinctive terrier breed.

The British Bulldog descends from Britain’s old baiting Bulldogs but has been extensively transformed through companion and show breeding. The French Bulldog developed partly from Britain’s smaller Toy Bulldogs and became a small companion breed, although it can retain plenty of bull-breed determination and drive.

The Old Tyme Bulldog is a modern attempt to recreate a more functional, athletic Bulldog type. The Bullmastiff was developed as a gamekeeper’s dog and carries considerably more guarding heritage. The Boxer descends partly from continental hunting and holding dogs and developed into a versatile working breed.

The American Bulldog has farm, catch-dog, livestock and guardian heritage. The American Pit Bull Terrier developed from bull-and-terrier stock taken from Britain and Ireland, while the American Staffordshire Terrier shares much of that history but became increasingly associated with conformation breeding.

Finally, the American Bully, including Pocket and XL varieties, is a much newer development intended predominantly as a muscular companion dog.

Their family trees overlap. Their selection histories do not, and that affects behaviour.

Are Bull Breeds Naturally Aggressive?

This sounds like a simple question, but it is not. “Aggression” is not one single personality trait. Dogs can display defensive aggression, fear-related aggression, territorial behaviour, resource guarding, dog-directed aggression, predatory behaviour, conflict-related aggression and human-directed aggression.

Those behaviours do not all have the same motivation or genetic basis.

Selective breeding can influence things such as prey drive, persistence, frustration tolerance, confidence, social behaviour, territoriality, guarding tendencies, sensitivity, arousal and responses to confrontation.

But those predispositions interact with everything that happens afterwards. Prenatal development, maternal care, early puppy development, health, pain, sleep, hormones, learning, socialisation, training and environment all matter too.

This is why the phrase “it’s all how you raise them” is too simplistic. But so is “they were bred for fighting, therefore they’re dangerous.”

Neither adequately explains canine behaviour.

Human Sociability and Dog Sociability Are Different Things

This is particularly important when discussing bull breeds. A breed can be extraordinarily people-orientated without necessarily being universally dog-social. Likewise, a guardian breed may be more naturally suspicious of unfamiliar humans without having any fighting history whatsoever.

That is why a Staffie may enthusiastically greet every human it encounters while becoming much more selective about canine company as it matures. Meanwhile, a Bullmastiff or American Bulldog may adore its immediate family but be more naturally watchful of an unfamiliar person entering the property.

Neither response makes the dog “good” or “bad”. It gives us information about the dog standing in front of us.

Dog Sociability Can Change During Adolescence

A four-month-old puppy’s attitude towards other dogs does not necessarily predict its adult social personality. A Staffie puppy might want to play with absolutely everything. At two years old, that dog may have three canine friends and very little interest in strangers.

An American Bulldog may become more watchful. A Bullmastiff may become more territorial. A Boxer may simply become much stronger while continuing to believe it should greet everyone at full speed.

Social maturity changes dogs. If an adolescent begins showing that it no longer enjoys close interactions with unfamiliar dogs, forcing it into increasingly intense social situations may make the problem worse. You do not necessarily need to “socialise it out of them”. Sometimes you need to listen.

Your dog does not need to love every dog. It needs to be able to behave safely when other dogs are present. Those are very different goals.

How Should Bull-Breed Puppies Be Raised?

Powerful dogs should not have to become powerful before training begins.

Training starts when the puppy comes home. That does not mean drilling or harshly correcting an eight-week-old puppy. It means beginning to teach them how their world works.

Teach their name, build engagement and introduce a marker word. Start recall. Teach lead pressure and loose lead walking. Introduce sit, down and stay, as well as leave and drop. Teach a bed or place cue. Handle paws, ears and mouths, and teach calmness around equipment. Most importantly, begin teaching the puppy that not everything they want appears immediately.

Build Frustration Tolerance

One of the greatest gifts we can give a puppy is the ability to cope with frustration.

That does not mean deliberately upsetting them. It means introducing tiny, manageable periods of waiting. The door opens when you are calm. The toy restarts when you release it. Another dog walks past and you do not greet it. You wait while your lead goes on. You settle while people eat.

For a tiny puppy these exercises can feel almost irrelevant. For a 45kg adolescent they become incredibly valuable.

Teach an Off Switch

Many bull breeds love physical activities such as tug, tracking, scent work, retrieving, obedience, hiking, searching and appropriate dog sports. But endlessly trying to exhaust an energetic dog can simply create a very fit energetic dog.

The ability to become excited is rarely the missing skill. The ability to come back down often is. Play, then settle. Train, then switch off. Explore, then rest.

I want dogs to have both gears: drive when appropriate and calm when appropriate.

Socialisation Does Not Mean Meeting Everybody

Perhaps the greatest misunderstanding around puppies generally is the word socialisation. Owners are told to socialise their puppy, so 50 strangers cuddle it and the puppy plays with every dog it sees. That is not necessarily useful socialisation.

Good socialisation teaches a puppy that the world is safe, predictable and often completely unremarkable. I want a puppy that can see children without chasing them, watch a bicycle pass, hear buses and lorries, walk over different surfaces and encounter wheelchairs, pushchairs and walking sticks.

I want them to see people in hats and uniforms, visit a café and eventually settle under the table, go to the vet when nothing unpleasant is happening, have their feet and ears handled, travel, experience towns and countryside, spend short periods alone and see another dog without thinking, “I must get there.”

The goal is not maximum interaction. The goal is confident neutrality.

Choose Dog Friends Carefully

Bull-breed puppies do not need fifty random dogs. I would rather give them five excellent canine role models.

Choose socially competent adult dogs and appropriately matched puppies. Good play contains pauses. Roles change. Dogs break away. Both dogs have the opportunity to stop, and both choose whether to return.

If one puppy continually pins, chases or body-slams another while the second dog repeatedly tries to escape, that is not necessarily good socialisation simply because nobody has bitten.

I am also cautious about allowing puppies to believe every dog predicts play. If you spend the first six months allowing your puppy to charge towards every dog it sees, you can inadvertently create a dog that believes access to dogs is an entitlement.

Then adolescence arrives, the lead prevents access and frustration appears. Pulling, whining, barking and lunging can follow. What started as overenthusiastic friendliness can become significant lead reactivity.

Sometimes one of the most valuable things a puppy can learn in a training class is simply: other dogs exist and nothing is happening.

Muzzle Training Should Be Normal

I would also positively introduce a well-fitting basket muzzle to powerful-breed puppies. Not because I expect them to bite, but because muzzles are useful equipment. A dog may need one following an injury, during veterinary treatment, because its behaviour changes later in life, during rehabilitation or because legislation requires it.

For exempted XL Bullies, public muzzle use is already mandatory, but muzzle training is useful for all dogs. It is far better for a puppy to learn that voluntarily putting its nose into a basket muzzle predicts something pleasant than for a frightened adult to encounter one for the first time during an emergency.

A muzzle is not a failure. It is equipment.

Training Does Not Finish at Puppy Class

Puppy class is the beginning. It is not graduation. Bull breeds can change enormously between six months and two years of age. Confidence changes. Hormones change. Strength increases. Prey drive may become more obvious. Guardian behaviour can emerge. Dog sociability can change and frustration becomes more significant.

Continue training throughout adolescence and into adulthood. Proof recall around increasing distractions. Practise loose lead walking. Develop stays. Work on visitor routines. Build calmness around other dogs. Visit new places. Continue handling exercises and muzzle work.

The 10kg puppy you train today is preparation for the 40kg dog you may be living with tomorrow.

Responsible Breeding Matters Just as Much as Responsible Ownership

We frequently talk about responsible owners. We should talk just as much about responsible breeders, because the future behaviour and welfare of a dog starts long before the puppy goes home.

Selecting stable parents matters. Health testing matters. Genetic diversity matters. Maternal health matters. The environment in which the litter is raised matters. Early handling matters. And deliberately avoiding extreme physical characteristics matters.

This is particularly relevant within modern bull-breed breeding.

The biggest head does not create the best dog. Neither does the rarest colour, the widest chest, the shortest legs, the greatest amount of muscle or the flattest face.

Before buying a puppy, I would much rather know whether the parents can breathe normally, walk and run comfortably, recover after exercise and live without chronic skin disease or pain.

I want to know what they are like around unfamiliar people and dogs, whether they can cope with frustration, whether they can settle, how they respond when something frightens them and whether the breeder has deliberately selected for stable temperament.

Producing dogs that look spectacular in photographs but cannot breathe, reproduce or comfortably move through the world is not progress.

Genetics Matter — But They Are Not a Verdict

Nobody is particularly surprised when a Border Collie tries to control movement. Nobody argues that genetics are irrelevant when a Labrador spends its life carrying things. Nobody looks at a terrier disappearing into a hedge after something furry and wonders where that behaviour came from. We readily understand that humans have selectively bred dogs for behavioural characteristics.

Bull breeds are not exempt from biology. If generations of dogs were selected for persistence, physical engagement, guarding, prey drive or determination, those characteristics may still influence modern descendants. That does not mean every dog will express them, but understanding them gives us information. And information allows us to train better.

Genetics are not destiny. But neither are they decoration.

Understanding Bull Breeds Is Better Than Demonising or Romanticising Them

Bull breeds have an extraordinary history. Their ancestors have worked alongside farmers, butchers and cattle dealers. They have been used in some of the cruellest sports humans have created. They have controlled livestock, killed vermin, caught wild animals, guarded estates, protected property and eventually become companion dogs.

Humans then continued changing them. We turned the old Bulldog into the British Bulldog. We created the tiny French Bulldog from smaller Bulldog stock. We developed the Bullmastiff to work alongside gamekeepers. We preserved the Staffie as a much-loved British companion. We attempted to recreate older, more athletic Bulldogs through dogs such as the Old Tyme Bulldog. And in America, bull-and-terrier ancestry eventually contributed to the modern American Bully, from the relatively short Pocket to the enormous XL.

Today they are Staffies sleeping underneath duvets, Bulldogs snoring on sofas, Frenchies carrying tug toys twice the size of their heads, Boxers bouncing through gardens, Bullmastiffs quietly watching the front door, Old Tyme Bulldogs hiking with their owners, Pocket Bullies strutting through town and exempted XL Bullies walking through British parks in basket muzzles alongside owners who love them dearly.

We should not erase their history, but neither should we condemn an individual dog because of it.

Understanding what dogs were bred from and what generations before them were selected to do gives us useful information. It tells us why responsible breeding matters. It helps us recognise behaviour as dogs mature. It influences how we socialise puppies. It tells us where additional training may be needed, and it reminds us why teaching a powerful puppy before it becomes a powerful adult is so important.

Raise them with affection. Give them rules and boundaries. Teach them to cope with frustration. Build confidence without creating overexcitement. Choose canine friendships carefully. Teach neutrality. Give them appropriate outlets. Teach them how to switch off. Continue training through adolescence. Choose breeders who prioritise health and temperament above appearance.

And above everything else, work with the individual dog standing in front of you.

We cannot change the history humans created for bull breeds, but by understanding that history – the good, the bad and the uncomfortable – we have a much better chance of giving their future generations healthier bodies, more stable temperaments and the skills they need to live successfully alongside us.

Because understanding what a dog was bred to do is not about labelling them. It is about understanding them well enough to give them what they need.

Legal information in this article reflects the UK position in August 2026. Legislation can change, so owners of prohibited or potentially prohibited dog types should always check the latest official government guidance for their part of the UK.