
Boston Terrier
The Boston Terrier is a friendly, dapper American breed known as the 'American Gentleman' for its tuxedo coat and amiable, playful nature.
- Size
- Small
- Lifespan
- 11–13 years
- Origin
- United States
- Temperament
- Friendly
- Standard colors
- Black, White, Seal and Mahogany
Characteristics
Coat and grooming
How the Boston Terrier coat is built, and what that means when you groom it.
- Coat layers
- Single coat
- Coat texture
- Smooth
- Coat length
- Short
- Shedding
- Moderate shedding
Boston Terrier colors and patterns
What each club's breed standard says about every Boston Terrier color and pattern. Point at a ruling to see the club's own wording.
Breed standards describe the Boston Terrier in Black, White, Seal and Mahogany. Standard patterns: Bicolour, Brindle and Reverse brindle.
| Color or pattern | FCI | AKC | UKC | KC | KUSA |
|---|---|---|---|---|---|
| Black | Standard (“black with white markings”) | Standard (“Black & White”) | Standard (“Black, with white markings”) | Standard (“black or seal with white markings acceptable”) | Standard (“black with white markings”) |
| White | Standard (“white markings”) | Standard (“white markings”) | Standard (“white markings”) | Standard (“white markings”) | Standard (“white markings”) |
| Seal | Standard (“seal”) | Standard (“Seal & White”) | Standard (“Seal”) | Standard (“black or seal with white markings acceptable”) | Standard (“seal”) |
| Mahogany | Standard (“Brindle”) | Standard (“Brindle & White”) | Standard (“Brindle”) | Standard (“Mahogany Brindle & White”) | Standard (“Brindle”) |
| Albino | Not recognised | Disqualifying | Disqualifying (“albinism”) | Not recognised | Not recognised |
| Blue | Disqualifying (“Grey or liver colours”) | Disqualifying | Disqualifying (“gray or liver colors”) | Not recognised (“Blue & White”) | Disqualifying (“Grey or liver colours”) |
| Lilac | Not recognised | Disqualifying | No ruling | Not recognised | Not recognised |
| Chocolate | Not recognised | Disqualifying | No ruling | Not recognised | Not recognised |
| Liver | Disqualifying (“Grey or liver colours”) | Disqualifying | Disqualifying (“gray or liver colors”) | Not recognised (“Red & White”) | Disqualifying (“Grey or liver colours”) |
| Red | Not recognised | Disqualifying | No ruling | Not recognised | Not recognised |
| Patterns | |||||
| Bicolour | Standard (“Brindle, seal or black with white markings”) | Standard (“Brindle, seal, or black with white markings”) | Standard (“Brindle, Seal, or Black, with white markings”) | Standard (“with white markings”) | Standard (“Brindle, seal or black with white markings”) |
| Brindle | Standard (“Brindle is preferred”) | Standard (“Brindle & White”) | Standard (“Brindle is preferred”) | Standard (“Brindle: being a mixture of any shade of brown and black”) | Standard (“Brindle is preferred”) |
| Reverse brindle | Standard (“Brindle is preferred”) | Standard (“Brindle & White”) | Standard (“Brindle is preferred”) | Standard (“Brindle: being a mixture of any shade of brown and black”) | Standard (“Brindle is preferred”) |
| Solid | Disqualifying (“Solid black, solid brindle, or solid seal without required white markings”) | Disqualifying (“Solid black, solid brindle or solid seal without required white markings”) | Disqualifying (“Solid seal, black or brindle without the required white markings”) | Not recognised | Disqualifying (“Solid black, solid brindle, or solid seal without required white markings”) |
| Merle | No ruling | No ruling | No ruling | Not recognised | No ruling |
| Double merle | No ruling | No ruling | No ruling | Not recognised | No ruling |
| Color or pattern | FCI | AKC | UKC | KC | KUSA |
|---|---|---|---|---|---|
| Dark brown | Standard (“dark in colour”) | Standard (“dark in color”) | Standard (“dark in color”) | Standard (“dark in colour”) | Standard (“dark in colour”) |
| Blue | Disqualifying (“Eyes blue in colour or any trace of blue”) | Disqualifying (“Eyes blue in color or any trace of blue”) | Disqualifying (“Any trace of blue in eyes”) | No ruling | Disqualifying (“Eyes blue in colour or any trace of blue”) |
| Patterns | |||||
| Sectoral | Disqualifying (“any trace of blue”) | Disqualifying (“any trace of blue”) | Disqualifying (“Any trace of blue in eyes”) | No ruling | Disqualifying (“any trace of blue”) |
| Color or pattern | FCI | AKC | UKC | KC | KUSA |
|---|---|---|---|---|---|
| Black | Standard (“Black and wide”) | Standard (“black and wide”) | Standard (“black and wide”) | Standard (“nose black”) | Standard (“Black and wide”) |
| Dudley | Disqualifying (“Dudley nose”) | Disqualifying (“Dudley nose”) | Disqualifying (“Dudley nose”) | No ruling | Disqualifying (“Dudley nose”) |
What the rulings mean
- Standard
- Described by the club's breed standard.
- Disqualifying
- The club's breed standard disqualifies an animal of this colour or pattern.
- Not recognised
- The club does not accept this colour or pattern for the breed.
Color changes
How a Boston Terrier's colors can change over its life.
Blackchanges toRust
Coat · With body condition · can change back
Blackchanges toGrey
Coat · Progressive
Blackchanges toBrown
Coat · In the sun · can change back
Whitechanges toRoan
Coat · With age · from 2 weeks
Blackchanges toSnow nose
Nose · With the season · can change back
Blackchanges toPink
Nose · With the season · can change back
Sources
Each ruling comes from the club's published breed standard or color list.
Health
Conditions recorded as more common in the Boston Terrier than in its species as a whole. A higher risk is not a diagnosis: many never develop any of them, and your vet can say which screening tests are worth doing.
Moderate risk
- Respiratory system
Brachycephalic obstructive airway syndrome
Moderate evidenceHereditaryInheritance: Polygenic
This content is for educational purposes and is not a substitute for professional veterinary advice. If you are worried about your pet, contact your veterinarian.
All health conditionsMeet some of our Boston Terrier
A few of the Boston Terrier profiles members have added to United Pet Club.
About the Boston Terrier
The Boston Terrier is a small, good-natured American dog, nicknamed the 'American Gentleman' for its tuxedo coat and affectionate temperament.
The Boston Terrier is a small companion breed that originated in the United States, instantly recognisable by its short muzzle, large round eyes and smooth coat marked out like a dinner jacket. Adults stand around 15 to 17 inches at the shoulder and weigh between 12 and 25 pounds, with the breed split into separate weight classes. Temperament stays consistent across the classes: these are friendly, alert dogs that thrive on human company.
The nickname 'American Gentleman' refers to the tuxedo-style colouring and the breed's generally well-mannered nature. Boston Terriers were bred purely as companions rather than working dogs, and they are at their happiest indoors with their family close by. They settle well into flats and houses alike, since their exercise needs are modest and most individuals are not given to excessive barking.
This is a breed that wants to be with people. A Boston Terrier left alone for long periods can become bored or anxious, so the dog suits a household where someone is usually about. The short face also makes the breed sensitive to heat and strenuous exercise in warm conditions, something owners need to plan around.
| Attribute | Detail |
|---|---|
| Origin | United States |
| Size | Small (12 to 25 lb) |
| Lifespan | 11 to 13 years |
| Group/role | Companion (non-sporting) |
| Good with | Families, children, other pets, older people |
Who it suits
The Boston Terrier suits first-time owners, flat dwellers, families with children and older people who want a small, affectionate dog without heavy grooming or exercise demands. It is less suited to anyone away from home all day, or to owners looking for a dog for endurance sports in hot climates.
History and origins of the Boston Terrier
The Boston Terrier was developed in Boston, Massachusetts in the late 1800s from crosses between the English Bulldog and the now-extinct white English Terrier.
The breed's story begins in Boston, Massachusetts, around 1870. A dog named Judge, often called Hooper's Judge, is recorded as the common ancestor of the modern Boston Terrier. Judge came from a cross between an English Bulldog and a white English Terrier, a terrier type that has since died out, and he was brought to Boston and mated to a smaller female, founding the line that local breeders refined over the following decades.
The early dogs were heavier and closer to a bull-and-terrier build than today's Boston Terrier. Through the 1880s, breeders around Boston selected for a smaller size, a steadier temperament and the distinctive tuxedo coat. Before the breed took the name of its home city, the dogs went by names such as Round Heads and Bull Terriers.
The American Kennel Club recognised the Boston Terrier in 1893, making it one of the first breeds developed in the United States to gain recognition there. Around the same time, breeders organised a club and wrote a standard that moved the dogs away from their fighting ancestry and towards the role of companion. In Ireland, pedigree Boston Terriers are registered with the Irish Kennel Club, the country's national registry for pedigree dogs.
Through the early twentieth century the Boston Terrier became one of the most popular breeds in the United States, and it was named the official state dog of Massachusetts in 1979.
Appearance and breed standard of the Boston Terrier
The Boston Terrier is a compact, square-built small dog with a short flat face, erect ears and a smooth tuxedo coat in brindle, black or seal with white markings.
The Boston Terrier has a sturdy, square outline, a short body, a level back and a low-set tail that is either straight or screw-shaped and naturally short. The head is square with a short, flat muzzle and a defined stop. The ears are small and carried erect, and the eyes are large, round, dark and set wide apart, giving the breed its open, attentive expression. The coat is short, smooth and fine.
| Trait | Standard |
|---|---|
| Height | 15 to 17 in at the shoulder |
| Weight | 12 to 25 lb (divided into under 15, 15 to under 20, 20 to 25 lb classes) |
| Coat | Short, smooth, fine textured |
| Colours | Brindle, black, or seal, each with white markings |
| Eyes | Large, round, dark, set wide apart |
Coat and colours
The coat carries the breed's signature tuxedo pattern. The standard recognises brindle, black or seal as the base colour, always combined with white markings. Seal looks black at first glance but shows a red cast in sunlight. Required white markings include a band around the muzzle, a blaze between the eyes and a white forechest. Solid colours, or shades such as liver and grey, fall outside the standard. The short, single coat sheds lightly and needs very little upkeep.
Temperament and personality of the Boston Terrier
Boston Terriers are friendly, affectionate and playful companions that bond closely with their families and usually get on well with children, strangers and other pets.
The Boston Terrier is a steady, good-natured companion that forms a strong attachment to its household and likes to stay close to its people, often trailing them from room to room. With children the breed is patient and playful, and its small but solid build copes with ordinary family life better than more delicate toy breeds manage.
Towards strangers, most Boston Terriers are friendly rather than wary. They will give a bark when someone arrives at the door, but they make poor guard dogs and usually warm to visitors within minutes. With other dogs, and with cats, the breed tends to be sociable, particularly when raised together or introduced while young.
The breed is alert and quick-witted, with a streak of clownish humour that owners regularly mention. Boredom and long periods alone are the main triggers for problem behaviour, since these are dogs bred for company and they do not cope well with being left for extended stretches. Many individuals are naturally quiet and bark only when there is reason to.
| Trait | Rating |
|---|---|
| Affection | 5 |
| Energy | 3 |
| Trainability | 4 |
| Vocalness | 2 |
| Shedding | 2 |
Caring for a Boston Terrier
The Boston Terrier needs little grooming and moderate daily exercise, but its short face means owners must guard against overheating and keep facial folds clean.
The Boston Terrier needs little upkeep in most respects. Its short coat and indoor, companionable temperament make day-to-day care straightforward, with most attention going to the eyes, face and heat tolerance.
Grooming
- Brush the short coat weekly with a soft brush or grooming mitt to lift away loose hair.
- Bathe every few weeks, or whenever the dog gets dirty.
- Wipe any facial folds and around the eyes to keep them clean and dry.
- Check the large eyes regularly for redness or debris, as prominent eyes are prone to irritation.
- Trim nails every few weeks and brush teeth several times a week.
Exercise
- Give one or two short walks a day plus some indoor play.
- Aim for roughly 30 to 60 minutes of activity in total, split into easy sessions.
- Use games and short training bouts to keep the dog's mind occupied.
- Avoid strenuous exercise in heat or humidity, as the short muzzle limits how well the dog can cool down.
Environment
The Boston Terrier suits flats and houses alike and prefers to live indoors with its family. It is sensitive to temperature extremes at both ends: the short coat gives little protection against cold, and the flat face raises the risk of overheating in warm weather. Ireland's cool, damp climate is generally kinder to this breed than hot climates are, though the dog should still be kept in a climate-controlled space during any spell of very hot or very cold weather.
Feeding a Boston Terrier
Boston Terriers do well on a complete diet for small breeds fed in measured portions, since the breed puts on weight easily and extra pounds strain its breathing.
A Boston Terrier needs a complete and balanced dog food suited to its life stage. Because the breed is small and prone to putting on weight, portion control matters more than the brand on the bag. Extra weight adds load to a respiratory system that is already limited by the short muzzle, so keeping the dog lean is one of the most useful things an owner can do for its health. Daily amounts depend on the dog's weight, age and activity level, so treat the figures below as a starting point and adjust so the ribs stay easily felt.
| Life stage | Amount per day | Meals |
|---|---|---|
| Puppy (2 to 6 months) | Per product label, by weight | 3 to 4 |
| Puppy (6 to 12 months) | Per product label, by weight | 2 to 3 |
| Adult | About 1 to 1.75 cups | 2 |
| Senior | Adjusted down for lower activity | 2 |
Treats and supplements
Keep treats to no more than about 10 percent of daily calories, and count them towards the daily total. A dog on a complete commercial diet usually needs no supplements; add them only on a vet's advice. Provide fresh water at all times, and divide food into measured meals rather than leaving it out all day.
Health and lifespan of the Boston Terrier
Boston Terriers live about 11 to 13 years and are generally healthy, though the short face and prominent eyes bring breed-specific risks owners should watch for.
The Boston Terrier has a typical lifespan of 11 to 13 years and is, overall, a robust small dog. Its build does carry a few predictable concerns, however: the flat face places it among the brachycephalic breeds, which affects breathing and heat tolerance, and the large, prominent eyes are exposed to injury and disease. Responsible breeders screen for known issues, and routine veterinary care catches most problems early.
| Condition | Signs | Note |
|---|---|---|
| Brachycephalic airway issues | Noisy or laboured breathing, snoring, heat intolerance | Keep the dog lean and avoid heat and overexertion |
| Eye problems (corneal ulcers, cataracts) | Cloudiness, redness, squinting, discharge | Prominent eyes are easily injured; check often |
| Patellar luxation | Skipping steps, intermittent hind-leg lameness | Ranges from mild to surgical |
| Allergies and skin sensitivity | Itching, ear infections, paw licking | Manageable with veterinary guidance |
| Deafness | Poor response to sound, often in dogs with a lot of white | Tested by BAER screening in pups |
Preventive care
- Stay current on vaccinations and parasite control.
- Book annual veterinary check-ups, moving to twice yearly for older dogs.
- Keep a lean body weight to protect breathing and joints.
- Brush teeth regularly, since small breeds are prone to dental disease.
- Choose breeding stock that has been screened for eyes, knees and hearing.
Training and socialising a Boston Terrier
Boston Terriers are intelligent and eager to please, so they respond well to consistent, reward-based training and socialise easily when started young.
The Boston Terrier is bright, attentive and keen to be with its owner, which gives training a natural head start. The breed responds well to short, upbeat sessions and to food and praise as rewards. A mild stubborn streak turns up in some dogs, but harsh correction backfires and tends to make a sensitive Boston withdraw. Early socialisation with people, places and other animals helps the breed grow into the friendly adult the standard describes. House-training can take patience, so keep a steady routine from the outset.
Basics
- Start socialisation in puppyhood with calm exposure to new people, dogs and settings.
- Teach name response and a reliable recall first.
- Build the core cues: sit, down, stay and leave it.
- Set a consistent house-training routine with frequent trips outside and praise for success.
- Practise short crate sessions to build comfort with time alone and reduce separation anxiety.
- Keep sessions short, around 5 to 10 minutes, and finish on a win.
Breeding Boston Terriers
Boston Terriers are difficult to breed: their build often calls for assisted mating and caesarean delivery, litters are small, and breeding suits experienced, health-tested breeders only.
Breeding Boston Terriers takes care and experience. Females usually reach sexual maturity by around 6 to 12 months, but responsible breeders wait until full maturity, generally about two years, and confirm health clearances before going ahead. The breed's narrow hips and the large heads of the puppies make natural mating and natural whelping difficult, so artificial insemination is common and many litters arrive by planned caesarean section.
Gestation runs about 63 days, as in other dogs. Litters are small, often just 1 to 4 puppies, which reflects the breed's body shape. Because whelping carries real risk, breeders typically work closely with a vet and plan for a surgical delivery from early on.
Newborn puppies need the same attention as any breed: warmth, frequent nursing and a gradual weaning from around three to four weeks. Early, gentle handling and exposure to everyday household sounds support the breed's friendly temperament. Responsible breeders screen parents for eye, knee and hearing problems, and place puppies only once they are weaned and have started their socialisation.
| Metric | Value |
|---|---|
| Sexual maturity | About 6 to 12 months |
| Recommended breeding age | About 2 years, after health clearances |
| Gestation | About 63 days |
| Typical litter size | 1 to 4 puppies |
| Delivery | Often caesarean section |
| Weaning | About 3 to 4 weeks onwards |
Registering your Boston Terrier in Ireland, chip and record both
Irish law wants every dog chipped and recorded; United Pet Club keeps your Boston Terrier's record free, current, and there for life.
How to register a Boston Terrier in Ireland
Get the profile sorted first: your Boston Terrier's name, his date of birth, a photo, and your phone number, saved in a couple of minutes. The record is free for the whole of his life, and the chip number slots in whenever the vet has done his part. Dog registration is where it starts.
The implant is the vet's job; the record is down to you, and the 2015 rules assume you'll keep it current. Register the microchip free on the lifetime plan: whatever brand the vet reached for is grand, a house move costs nothing to record, and the number stays searchable day and night. Create your free account and have the pair of jobs done before the tea goes cold.
How do I register my Boston Terrier in Ireland?
Set yourself up with a free United Pet Club account, key in your Boston Terrier's details and a photo, and save. The profile holds for the whole of his life without charge, and the chip number can be lodged whenever you have it.
How do I register my Boston Terrier's microchip?
Lodge the fifteen digit chip number in your free account along with your address and phone number. The lifetime plan covers the registration and every update after it, free, whatever brand the vet used.
Is microchipping a Boston Terrier required in Ireland?
It is. The 2015 Regulations require every dog to be chipped and registered, pup or rescue alike. Keeping the record current is the part that falls to you, and United Pet Club makes that part free.
What does it cost to register a Boston Terrier in Ireland?
Not a penny. Profile, chip record, and every amendment are covered for life, with no renewal ever.
Frequently asked questions about the Boston Terrier
Common questions about the Boston Terrier's size, temperament, care needs, lifespan and suitability as a family companion.
How big does a Boston Terrier get?
Boston Terriers are a small breed, standing about 15 to 17 inches at the shoulder and weighing between 12 and 25 pounds. The breed is split into weight classes: under 15 lb, 15 to under 20 lb, and 20 to 25 lb.
What is the Boston Terrier's temperament like?
The breed is friendly, affectionate, playful and alert. Boston Terriers bond closely with their families, usually get on well with children and other pets, and are typically welcoming towards strangers.
Are Boston Terriers easy to look after?
Yes, in most respects. The short coat needs only a weekly brush and exercise needs are moderate. The main extra care involves protecting the dog from heat, keeping an eye on the prominent eyes, and keeping it at a lean weight.
How long do Boston Terriers live?
The typical lifespan is 11 to 13 years. Good weight management, dental care and routine vet visits help many dogs reach the upper end of that range.
Are Boston Terriers good for flats and first-time owners?
Yes. Their small size, moderate exercise needs and generally quiet, sociable nature suit flats, families and people new to owning a dog.
Do Boston Terriers have breathing problems?
Because of the short, flat face, the breed can suffer from brachycephalic airway issues and limited heat tolerance. Avoiding heat and hard exercise, and keeping the dog lean, reduces the strain.
Are Boston Terriers hard to breed?
Yes. The breed's body shape often calls for assisted mating and caesarean delivery, and litters are small. Breeding is best left to experienced breeders who health-test the parents.
From the community
Ask about the Boston TerrierNo questions about the Boston Terrier yet. Be the first to ask.
Browse Dog breeds






