French Bulldog Mixed With a Boston Terrier: The Frenchton Breed Guide
French Bulldog mixed with a Boston Terrier (Frenchton): size, temperament, health risks, grooming, cost
If you've spent any time scrolling through designer dog listings, you've likely encountered the French Bulldog mixed with a Boston Terrier — most commonly marketed as the Frenchton (though you'll also see "Frenchbo," "Faux Frenchbo," or "Boston Frenchie"). This cross pairs two compact, bat-eared companion breeds that share more than a passing resemblance. But combining them doesn't produce a carbon-copy dog, and prospective owners need to understand the variability baked into any first-generation or multigeneration mix.
This guide breaks down what you can reasonably expect — and what you can't — when bringing home a French Bulldog mixed with a Boston Terrier. We'll cover parent breed traits, generational differences, health realities (including the stubborn hybrid vigor myth), real-world costs in 2026, and whether this mix actually fits your household.
What Two Breeds Make Up the Frenchton?
The Frenchton is a deliberate cross between two AKC-recognized breeds that sit in the same size bracket and share a brachycephalic (short-muzzled) skull structure. Understanding each parent breed is essential because any individual puppy can lean heavily toward one side or land somewhere in between.
French Bulldog (Parent Breed 1)
Originally developed in 19th-century France from smaller English Bulldogs crossed with local ratters, the French Bulldog has held the #1 spot in AKC popularity rankings since 2022. They're known for their muscular, low-slung build, large bat ears, and short, smooth coat. Frenchies typically weigh 16–28 lb (7–13 kg) and stand 11–13 inches (28–33 cm) at the shoulder. Their temperament skews affectionate, clownish, and stubborn — they bond intensely with their people but can be selectively deaf when asked to do something they'd rather not. They're notoriously difficult to breed naturally; most French Bulldogs require artificial insemination and cesarean delivery, which drives up puppy prices.
Boston Terrier (Parent Breed 2)
The Boston Terrier originated in the United States in the 1870s, descended from a cross between an English Bulldog and a now-extinct white English Terrier. Refined into a compact companion, Bostons weigh 12–25 lb (5–11 kg) and stand 15–17 inches (38–43 cm) tall. They're leggier and more athletic than Frenchies, with a tuxedo-like coat pattern (though other colors exist). Bostons tend to be more trainable and energetic than French Bulldogs, retaining some terrier-drive that surfaces as enthusiasm for fetch, agility, and the occasional squirrel chase. The AKC classifies them in the Non-Sporting Group.
| Trait | French Bulldog | Boston Terrier |
|---|---|---|
| Weight | 16–28 lb (7–13 kg) | 12–25 lb (5–11 kg) |
| Height | 11–13 in (28–33 cm) | 15–17 in (38–43 cm) |
| Lifespan | 10–12 years | 11–13 years |
| Energy Level | Low to moderate | Moderate to high |
| Trainability | Moderate (stubborn streak) | Moderate to high |
| Shedding | Low, seasonal | Low, seasonal |
| AKC Group | Non-Sporting | Non-Sporting |
Generations Explained: F1, F1B, F2, and Multigen Frenchtons
Not all French Bulldog and Boston Terrier mixes are genetically equivalent. The generation designation tells you how the cross was produced and gives you a rough idea of trait predictability.
F1 (First Generation): One purebred French Bulldog parent + one purebred Boston Terrier parent. Puppies inherit 50/50 genetics. Trait expression is the most variable — one littermate might look almost entirely Frenchie while another favors the Boston side. This is the most common Frenchton type you'll encounter.
F1B (First Generation Backcross): An F1 Frenchton bred back to one of the parent breeds (usually the French Bulldog, given market demand). Result is roughly 75% one breed and 25% the other. Slightly more predictable in appearance but concentrates the health risks of the backcross breed.
F2 (Second Generation): Two F1 Frenchtons bred together. Genetic variability actually increases in F2 litters because recessive traits from both breeds can resurface in unpredictable combinations. You may get puppies that look very different from each other.
Multigen (F3+): Frenchtons bred to Frenchtons across multiple generations. Rare for this particular cross — unlike Labradoodles or Goldendoodles, Frenchton multigeneration breeding programs are uncommon. Some breeders market dogs as "multigen" without documented lineage, so always request pedigree paperwork.
Practical takeaway: Most Frenchtons on the market are F1. If a breeder advertises F1B or multigen, ask for documentation of which parent breed was used in the backcross and why. There's no inherent advantage to later generations in a brachycephalic mix — in fact, concentrating French Bulldog genetics through backcrossing can worsen airway conformation.
How Big Will a French Bulldog Mixed With a Boston Terrier Get?
Because both parent breeds are small companion dogs, the Frenchton's size range is relatively narrow — but not identical from puppy to puppy. Leg length, bone density, and overall build vary depending on which parent's frame the puppy inherits.
Puppies typically reach about 75% of their adult weight by 6 months and full size by 10–12 months. If you're adopting an F1 puppy, ask the breeder for the exact weights of both parents — a heavier Frenchie sire (25+ lb) paired with a smaller Boston dam (14 lb) can produce a wide spread within a single litter.
Coat Type, Colors, and Shedding: What to Expect
Both French Bulldogs and Boston Terriers carry short, smooth, single-layer coats, so Frenchtons almost universally inherit this coat type. You won't find wire-haired or long-coated Frenchtons unless a different breed has been introduced (which happens more often than you'd think in unverified "designer" listings).
Shedding level: Low to moderate year-round with seasonal upticks in spring and fall. Neither parent breed is a heavy shedder, but both do shed — this is not a hypoallergenic mix. If you have dog dander allergies, a Frenchton is unlikely to work for your household. No dog is truly hypoallergenic, but breeds like Poodles and Bichon Frises produce less of the Can f 1 protein that triggers most human allergic reactions. Frenchtons do not share that trait.
Common coat colors and patterns:
- Brindle (dark striping on a lighter base — very common from both breeds)
- Black and white (classic Boston Terrier "tuxedo" pattern)
- Fawn (light tan, inherited from the Frenchie side)
- Cream or white with patches
- Blue/gray (dilute gene — controversial, as it's linked to color dilution alopecia)
- Pied or piebald (white base with colored patches)
Grooming needs: Minimal. A weekly brush with a rubber grooming mitt or soft bristle brush keeps loose hair controlled. Pay more attention to the facial folds — Frenchtons that inherit deeper wrinkles from the Frenchie side need daily fold cleaning with a damp cloth or veterinary-recommended wipe to prevent yeast and bacterial intertrigo (skin fold dermatitis). Nail trims every 2–3 weeks, ear cleaning weekly (especially if the bat ears are fully erect and open), and dental brushing 3–5 times per week round out the routine.
Temperament Range: Best-Case and Challenging Scenarios
The French Bulldog and Boston Terrier share some temperament traits — both are people-oriented, generally friendly with strangers, and tend to form strong bonds with their primary humans. But they diverge in ways that create a spectrum of possible outcomes in their offspring.
Best-Case Temperament Scenario
Your Frenchton inherits the Boston Terrier's trainability and energy balance alongside the Frenchie's easygoing affection. You get a dog that's eager to learn tricks with positive reinforcement training, enjoys 30–45 minutes of daily activity (walks, indoor play, puzzle toys), greets visitors warmly, and settles calmly in the evening. Good with children who understand gentle handling, generally tolerant of other dogs with proper socialization during the 3–14 week critical period.
Challenging Temperament Scenario
Your Frenchton inherits the Frenchie's stubbornness combined with the Boston's higher energy drive — resulting in a dog that wants to be active but refuses to follow cues. You may see leash pulling, selective hearing, resource guarding of food or toys (both breeds can be prone to this without early training), and difficulty with housebreaking (Frenchies are notoriously slower to potty train than Bostons). Some Frenchtons develop separation anxiety if left alone for extended periods, manifesting as destructive chewing or excessive vocalization.
Key temperament variables to prepare for:
- Trainability: Plan on 8–16 weeks of consistent positive reinforcement training. French Bulldogs rank lower on working/obedience intelligence scales (Stanley Coren's classification places them in the "fair" working intelligence tier), while Bostons rank slightly higher. Your mix could land anywhere on that spectrum.
- Vocalization: Both breeds snort, snore, and make distinctive noises due to their brachycephalic anatomy. Bostons tend to bark more than Frenchies. Expect moderate vocalization — not a quiet dog, but not a nuisance barker either.
- Prey drive: Boston Terriers retain terrier instincts and may chase small animals. Early exposure to cats and small pets helps, but supervise interactions regardless.
- Heat tolerance: Poor. Both breeds are brachycephalic and struggle with thermoregulation. Your Frenchton should never exercise in temperatures above 80°F (27°C) or high humidity. Always carry water and watch for excessive panting, blue-tinged gums, or collapse.
Health Considerations: The Hybrid Vigor Myth and Real Inherited Risks
Let's address the elephant in the room: hybrid vigor does not eliminate health problems in designer crosses. The concept of heterosis (hybrid vigor) applies primarily to traits controlled by many genes — things like fertility, litter size, and general hardiness. It does not magically erase structural health conditions that both parent breeds share. And when both parents are brachycephalic, the puppies face compounded airway and skeletal risks.
Here's what you're realistically looking at:
| Condition | Inherited From | Prevalence | Typical Treatment Cost (USD) |
|---|---|---|---|
| Brachycephalic Obstructive Airway Syndrome (BOAS) | Both breeds | Very high — estimated 50%+ of brachycephalic dogs show clinical signs | $2,500–$7,000 for corrective surgery |
| Patellar Luxation | Both breeds | Moderate — common in small breeds | $1,500–$4,000 per knee |
| Allergies (atopic dermatitis, food) | Both breeds (Frenchies especially prone) | High — Frenchies are among the most allergy-prone breeds | $300–$1,500/year ongoing management |
| Hip Dysplasia | Both breeds | Moderate | $1,500–$6,000 (surgical) |
| Cataracts / Juvenile Cataracts | Boston Terrier (hereditary) | Moderate in Bostons | $2,700–$4,000 per eye |
| Intervertebral Disc Disease (IVDD) | French Bulldog (chondrodystrophic breed) | Moderate to high in Frenchies | $3,000–$8,000 (surgical decompression) |
| Corneal Ulcers | Both (prominent eyes) | Moderate | $200–$2,500 depending on severity |
BOAS deserves special attention. Brachycephalic Obstructive Airway Syndrome is not a matter of "if" but "how severe." The shortened skull doesn't proportionally reduce soft tissue — meaning excess palate tissue, narrowed nostrils (stenotic nares), and a relatively large tongue crowd the airway. Signs include noisy breathing at rest, exercise intolerance, gagging or regurgitation after eating, and sleep apnea. If your Frenchton shows these symptoms, consult your veterinarian about diagnostic imaging and whether surgical intervention (nares resection, soft palate trimming) would improve quality of life.
Recommended health screenings for breeding parents (ask any breeder for these results):
- Orthopedic Foundation for Animals (OFA) hip evaluation
- OFA patella evaluation
- Canine Ophthalmologists Registry (CERF) eye exam
- Cardiac evaluation
- BOAS functional assessment (some veterinary centers now offer standardized airway scoring)
⚠️ Veterinary Disclaimer: This article provides educational information and does not replace professional veterinary advice. If your Frenchton shows signs of breathing difficulty, persistent coughing, exercise collapse, or eye injury, seek veterinary care immediately. Always consult your veterinarian before starting any treatment, supplement, or dietary change.
Who Is the Frenchton Best Suited For?
After working with dozens of owners of brachycephalic mixes, I can tell you the Frenchton fits a specific lifestyle well — and is a poor match for others. Here's a practical decision framework:
| Your Situation | Frenchton Fit? | Why |
|---|---|---|
| Apartment dweller, no yard | ✅ Good fit | Compact size, moderate exercise needs, not a nuisance barker |
| Family with children under 5 | ⚠️ Proceed with caution | Small dogs are fragile; young children must be taught gentle handling. Supervision is non-negotiable. |
| Active runner/hiker | ❌ Poor fit | Brachycephalic airways cannot sustain prolonged aerobic activity, especially in heat |
| Work from home, want a lap companion | ✅ Excellent fit | Thrives on proximity to people, low exercise demands |
| Away from home 8+ hours daily | ❌ Poor fit | Separation anxiety risk is high; these dogs need company |
| Hot/humid climate (Southeastern US, etc.) | ⚠️ Requires management | Air conditioning is mandatory, outdoor time must be limited in summer |
| First-time dog owner | ✅ Reasonable fit | Forgiving of training mistakes, but housebreaking patience required |
Cost Breakdown: What You'll Actually Spend
Designer dog pricing has shifted considerably, and Frenchtons command a premium due to the French Bulldog parent's market value. Here's what to budget for in 2026:
Purchase Price
- From a responsible breeder (health-tested parents, take-back clause): $1,500–$3,500
- From a high-volume/backyard breeder: $800–$1,500 (often without health screening — higher long-term veterinary costs)
- Rescue/adoption: $200–$600. Frenchton-specific rescues are rare, but French Bulldog and Boston Terrier breed rescues occasionally take in mixes. Check ASPCA's shelter database and Petfinder for local availability.
First-Year Estimated Costs
| Category | Estimated Cost |
|---|---|
| Puppy purchase | $1,500–$3,500 |
| Initial veterinary (vaccines, spay/neuter, microchip) | $600–$1,200 |
| Food (quality kibble, ~1 cup/day) | $300–$500/year |
| Supplies (crate, harness, bed, bowls, toys) | $250–$500 |
| Training classes (group positive reinforcement) | $150–$400 |
| Pet insurance (recommended for brachycephalic breeds) | $40–$80/month |
| First-year total (excluding purchase) | $1,340–$3,080 |
Insurance note: Given the high probability of BOAS-related veterinary costs, pet insurance is strongly recommended for this mix. Most policies cover hereditary and congenital conditions if enrolled before symptoms appear. Compare providers like Trupanion, Healthy Paws, and Nationwide — look for policies with no breed exclusions and short waiting periods.
Frequently Asked Questions
Is the French Bulldog mixed with a Boston Terrier hypoallergenic?
No. Both parent breeds have short, shedding coats and produce normal levels of dander and saliva proteins (Can f 1 and Can f 2) that trigger human allergies. No dog is truly hypoallergenic, but Frenchtons are not even "low-allergen." If allergies are a concern, consider spending time with a Frenchton before committing, and invest in a HEPA air purifier for rooms where the dog spends the most time.
Can Frenchtons be left alone during the workday?
Short periods (3–4 hours) are generally manageable for an adult Frenchton with proper crate training and enrichment toys. Beyond that, separation anxiety risk increases significantly. These dogs are bred for companionship and do best in households where someone is home for much of the day. If you work full-time outside the home, consider a dog walker for a midday visit or look into doggy daycare (ensure the facility understands brachycephalic exercise limits).
How long do Frenchtons live?
The expected lifespan is 11–14 years, which is slightly better than the purebred French Bulldog average (10–12 years) and comparable to the Boston Terrier (11–13 years). Lifespan depends heavily on managing weight (obesity worsens BOAS), keeping up with dental care (small breeds are prone to periodontal disease by age 3), and addressing any airway issues early rather than waiting for crisis-level breathing problems.
Are Frenchtons recognized by the AKC?
No. The American Kennel Club does not recognize designer crosses. Frenchtons may be registered with organizations like the American Canine Hybrid Club (ACHC) or the Designer Breed Registry (DBR), but these registrations don't carry the same health-testing requirements as AKC breeding programs. AKC recognition isn't a quality marker on its own, but responsible breeders of both parent breeds participate in AKC health testing protocols that benefit all offspring.
Do Frenchtons get along with other dogs?
Generally yes, with proper socialization during the critical 3–14 week window. Both French Bulldogs and Boston Terriers are typically sociable with other dogs, though some individuals — particularly intact males — can show same-sex aggression. Early puppy classes, controlled introductions, and positive reinforcement for calm behavior around other dogs go a long way. Always supervise play with much larger dogs, as a 20-lb Frenchton is easily injured by roughhousing with a 70-lb Labrador.
What should I feed a Frenchton?
Choose an AAFCO-complete small-breed adult formula with a named protein source (chicken, lamb, salmon) as the first ingredient. Small-breed kibble pieces are easier for compact jaws to manage. Feed approximately ¾ to 1¼ cups per day split into two meals, adjusted to maintain a body condition score (BCS) of 4–5 out of 9. French Bulldogs are particularly prone to food allergies, so if your Frenchton develops itchy skin, ear infections, or digestive upset, consult your veterinarian about a limited-ingredient diet or novel protein trial — don't switch foods randomly without a systematic elimination protocol.
Tom Renshaw
All our authors care for dogs every day — read more of their work on the authors page.
