St Bernard and Lab Mix: Complete Guide to This Gentle Giant Cross
Everything about the St Bernard and Lab mix: size, temperament, coat types, health risks, costs, and whether this giant designer cross fits your family.
If you've ever wondered what happens when you combine one of the world's most iconic rescue dogs with America's most popular breed, the St Bernard and Lab mix (sometimes called a "Saint Labernard" or "Labernard") is the result. This is a large-to-giant designer cross that pairs the Labrador Retriever's enthusiasm and trainability with the Saint Bernard's calm, watchful demeanor. But before you bring home a puppy that could weigh as much as a small adult human, you need a clear-eyed picture of what this mix actually entails.
I've worked with dozens of giant-breed owners and mixed-breed dogs through rescue and clinic settings. The honest truth? This cross is not for everyone. The size alone demands serious logistical planning — from vehicle capacity to joint-health budgets. Below, I'll walk you through everything you need to know, grounded in breed standards, veterinary data, and real-world ownership experience.
Parent Breed Breakdown: Labrador Retriever Meets Saint Bernard
Understanding any mixed breed starts with understanding its parent breeds. The traits your St Bernard and Lab mix inherits will fall somewhere along the spectrum between these two very different dogs.
| Trait | Labrador Retriever (AKC Standard) | Saint Bernard (AKC Standard) |
|---|---|---|
| Weight Range | 55–80 lb / 25–36 kg | 120–180 lb / 54–82 kg |
| Height (at shoulder) | 21.5–24.5 in / 55–62 cm | 26–30 in / 66–76 cm |
| Lifespan | 11–13 years | 8–10 years |
| Coat Type | Short, dense, double coat | Short (smooth) or long (rough), dense double coat |
| Energy Level | High — needs 60+ min vigorous exercise daily | Low to moderate — 30–45 min of walking suffices |
| Temperament Core | Outgoing, eager, highly trainable, mouthy | Calm, watchful, gentle, independent thinker |
| Shedding | Heavy year-round, seasonal blowouts | Moderate to heavy, seasonal blowouts |
| Original Function | Retrieving waterfowl for hunters | Alpine rescue, drafting, monastery companion |
| Drool Factor | Low | Very high (especially rough-coated types) |
The Labrador Retriever has held the top spot in AKC popularity rankings for decades, prized for versatility and biddability. The Saint Bernard, recognized by the AKC since 1885, is a working-group giant originally bred by monks at the Great Saint Bernard Hospice in the Swiss Alps. These two breeds diverge significantly in energy, size, and maintenance needs — which is exactly why their offspring can be so variable.
Generation Explained: F1, F1B, and Beyond
For the St Bernard and Lab mix, you'll typically encounter these generation labels:
- F1 (First Generation): One purebred Labrador × one purebred Saint Bernard. Maximum genetic diversity, but highest trait unpredictability. Puppies in the same litter can look and behave very differently.
- F1B (Backcross): An F1 Saint Labernard bred back to one of the parent breeds (usually the Labrador, to reduce size). Slightly more predictable traits leaning toward the backcross parent.
- F2 (Second Generation): Two F1 Saint Labernards bred together. This is where trait variation becomes widest — puppies can strongly favor either grandparent breed or land anywhere in between.
- Multigen (F3+): Multiple generations of Saint Labernard-to-Saint Labernard breeding. Extremely rare for this particular cross. Most breeders don't pursue multigen Saint Labernards because the size variability and health concerns make stabilization difficult.
Note: Unlike Poodle mixes (doodles), the Saint Labernard has not developed a robust multigen breeding community. Most available puppies are F1 crosses from breeders who pair one of each parent breed.
If a breeder advertises "multigen Saint Labernards," ask for documentation of at least three generations of planned breeding. Without pedigree records, you have no way to verify the claim, and the puppies are likely just F1 or F2 crosses marketed at a premium.
How Big Will a St Bernard and Lab Mix Get?
This is the question every prospective owner asks first, and the honest answer is: the size range is enormous. Because the parent breeds differ by 60–100 lb, predicting adult size for an individual puppy is genuinely difficult until around 6–8 months of age.
| Size Category | Weight (lb / kg) | Height at Shoulder (in / cm) | Likely Parent Lean |
| Small End (Lab-dominant) | 65–90 lb / 29–41 kg | 22–25 in / 56–64 cm | Favors Labrador |
| Mid-Range (Balanced mix) | 90–130 lb / 41–59 kg | 25–28 in / 64–71 cm | Even blend |
| Large End (Saint-dominant) | 130–160+ lb / 59–73+ kg | 28–30+ in / 71–76+ cm | Favors Saint Bernard |
Practical implications of this size spread:
- Vehicle requirements: A 140-lb dog needs a large SUV cargo area or a full-size truck. Standard sedans won't work for safe transport.
- Food costs: A 130-lb dog eats roughly 5–7 cups of high-quality kibble daily. Budget $80–$140/month on food alone for a large-end specimen.
- Joint stress: Every extra pound above the Labrador's natural frame compounds hip and elbow stress. Giant-breed joint supplements (glucosamine/chondroitin at 500–1000 mg glucosamine daily for dogs over 80 lb) become a lifelong expense.
- Housing: Many apartment complexes and some HOAs cap dog weight at 50–80 lb. A Saint Labernard at the mid-range or above will exceed most weight restrictions.
Male puppies will typically land at the higher end of whatever range their genetic inheritance dictates. Females tend toward the lower end. If size is a concern, requesting a female puppy gives you a slightly better chance of staying under 100 lb.
Temperament: What to Expect (and What Might Surprise You)
The temperament of a St Bernard and Lab mix is where the "designer dog gamble" becomes most apparent. You're combining two breeds with fundamentally different drives:
- Labrador's eagerness to please combined with Saint Bernard's calm steadiness
- Highly trainable but not hyperactive — responds well to positive reinforcement sessions of 10–15 minutes
- Gentle with children and other household pets
- Watchful without being aggressive — alerts to strangers but warms up quickly
- Content to lounge indoors after adequate exercise
- Labrador's high energy trapped in a Saint Bernard-sized body — a 120-lb dog pulling on leash with 80 lb of drive
- Saint Bernard's stubborn independence overriding the Lab's trainability
- Mouthiness and jumping behavior from the Lab side, amplified by giant-breed strength
- Potential same-sex dog aggression (seen in some Saint Bernard lines)
- Separation anxiety if left alone for long hours — both breeds are people-oriented
Critical training note: With a dog that may reach 130+ lb, leash manners are not optional — they are a safety necessity. Start leash training at 8–10 weeks using a front-clip harness (such as the Ruffwear Front Range or Kurgo Tru-Fit in XL/XXL sizes). Use only positive reinforcement methods: reward-based lure training, treat marking for loose-leash walking, and redirection. Aversive tools like prong collars or shock collars are both ethically wrong and physically dangerous on a dog with the neck structure of a Saint Bernard cross.
Socialization windows matter enormously here. The AVMA recommends structured socialization between 3 and 14 weeks of age. For a giant-breed mix, every positive exposure to novel surfaces, sounds, people, and other dogs during this window pays dividends for the next decade. A poorly socialized 140-lb dog is a liability; a well-socialized one is a gentle ambassador.
Coat, Shedding, and Grooming Reality
Let's address this directly: the St Bernard and Lab mix is not hypoallergenic, and it is not low-shedding. Both parent breeds have double coats that shed heavily, and there is no genetic mechanism in either breed for a hypoallergenic coat type. If you have dog allergies, this is not the mix for you.
The coat your individual dog inherits will fall into one of three categories:
- Labrador-type coat (most common in F1): Short, dense, straight, with a water-resistant undercoat. Sheds consistently year-round with seasonal blowouts in spring and fall. Requires brushing 2–3 times per week with a slicker brush or undercoat rake (the Furminator deShedding tool in Large/Short-Hair works well).
- Saint Bernard smooth coat: Similar length to the Lab coat but denser, with more pronounced undercoat. Higher shedding volume. Same brushing schedule, but expect more fur per session.
- Saint Bernard rough coat (longer): Medium-length, slightly wavy fur with heavier feathering on legs, chest, and tail. Requires daily brushing to prevent matting, especially behind the ears and in the "pants" area. Professional grooming every 8–10 weeks recommended ($60–$90 per session for a dog this size).
Drool management: If your mix inherits the Saint Bernard's loose lip structure (flews), expect significant drooling — especially after drinking, eating, or in warm weather. Keep drool rags accessible. The rough-coated Saint Bernard type tends to drool more because longer fur around the mouth wicks and holds moisture.
Health Considerations: Hybrid Vigor vs. Inherited Reality
It's a common claim that mixed breeds benefit from "hybrid vigor" — the idea that crossing two purebreds automatically produces healthier offspring. Here's what the veterinary science actually says: hybrid vigor (heterosis) can reduce the risk of recessive genetic conditions that require two copies of a defective gene. It does not protect against dominant or polygenic conditions, and it does not eliminate structural health risks that both parent breeds share.
According to research published in the Merck Veterinary Manual, the following conditions pose real risks for the St Bernard and Lab mix because both parent breeds carry susceptibility:
| Condition | Prevalence in Parent Breeds | Signs to Watch For | Typical Treatment Cost Range |
|---|---|---|---|
| Hip Dysplasia | Labrador: ~12% (OFA data); Saint Bernard: ~25–30% | Bunny-hopping gait, reluctance to rise, hind-end sway | $1,500–$7,000 per hip (surgical) |
| Elbow Dysplasia | Labrador: ~10%; Saint Bernard: ~15–20% | Front-leg lameness, stiffness after rest | $1,500–$4,000 per elbow |
| Gastric Dilatation-Volvulus (Bloat/GDV) | Saint Bernard: high risk (deep-chested); Labrador: moderate risk | Distended abdomen, unproductive retching, restlessness, collapse | $3,000–$7,000+ (emergency surgery) |
| Dilated Cardiomyopathy (DCM) | Saint Bernard: known predisposition; Labrador: emerging concern | Coughing, exercise intolerance, fainting, abdominal swelling | $500–$2,000+ (lifelong medication management) |
| Osteosarcoma (Bone Cancer) | Saint Bernard: elevated risk; Labrador: moderate risk in giant size range | Persistent lameness, swelling on limb, pain on palpation | $5,000–$12,000+ (amputation + chemotherapy) |
Gastric dilatation-volvulus is a life-threatening emergency. If your St Bernard and Lab mix shows a distended abdomen, attempts to vomit without producing anything, pacing, or sudden collapse — go to an emergency veterinary clinic immediately. GDV can kill within hours. Ask your veterinarian about prophylactic gastropexy (stomach tacking) at the time of spay/neuter, which reduces GDV risk by approximately 85%. This preventive surgery typically costs $400–$800 when performed alongside a spay/neuter procedure.
Prevention measures: feed 2–3 smaller meals per day (never one large meal), use a slow-feeder bowl, avoid vigorous exercise for 60 minutes before and after eating, and avoid elevated food bowls (research shows elevated feeders may actually increase bloat risk in large/giant breeds).
Recommended health screenings before breeding (ask any breeder for these):
- OFA or PennHIP hip evaluation — both parents scored
- OFA elbow evaluation — both parents scored
- OFA cardiac evaluation — echocardiogram for the Saint Bernard parent
- Eye examination by a veterinary ophthalmologist (CERF/OFA)
- Exercise-induced collapse (EIC) DNA test — relevant from the Labrador side
Always consult your veterinarian about an appropriate screening and preventive care schedule for your individual dog. Giant-breed mixes benefit from biannual wellness exams rather than annual ones, especially after age 5.
Cost Breakdown: Purchase Price and Lifetime Ownership
The St Bernard and Lab mix is not among the most heavily marketed designer breeds (unlike Goldendoodles or Labradoodles), which affects both availability and pricing.
| Acquisition Method | Typical Cost Range (USD) | What's Usually Included |
|---|---|---|
| Reputable Breeder (F1) | $800–$2,000 | First vaccinations, deworming, health guarantee, parent health test documentation |
| Backyard Breeder / Online Listing | $300–$800 | Often nothing — no health testing, no guarantee, no take-back clause |
| Breed-Specific Rescue | $200–$500 | Spay/neuter, vaccinations, microchip, basic vetting |
| General Shelter / Humane Society | $50–$300 | Spay/neuter, vaccinations, microchip |
First-year ownership costs for a giant-breed mix are substantial and often surprise new owners:
- Food (12 months): $900–$1,700 (large-breed puppy formula transitioning to adult giant-breed formula)
- Veterinary care (year one): $600–$1,200 (puppy vaccine series, spay/neuter, heartworm prevention, fecal exams)
- Supplies: $400–$800 (XXL crate — 48" minimum — $80–$200; heavy-duty bed $60–$150; large harness $30–$60; stainless steel bowls; grooming tools)
- Preventive medications: $300–$600/year (heartworm, flea/tick — note that doses are weight-based, so giant dogs require the most expensive tier)
- Pet insurance: $60–$120/month for a giant-breed puppy (companies like Trupanion, Healthy Paws, or Nationwide — premiums are higher for breeds with known orthopedic risk)
Estimated first-year total: $2,800–$5,500+ depending on acquisition cost, your region, and whether any health issues arise. Ongoing annual costs after year one typically run $2,000–$3,500 for a healthy giant-breed dog.
Is This the Right Mix for Your Family?
The St Bernard and Lab mix thrives in a specific set of circumstances. Here's a practical decision framework:
- Have a house with a securely fenced yard (minimum 6-foot fence — these dogs can be surprisingly athletic)
- Have experience with large or giant breeds, or are committed to working with a certified professional dog trainer (CPDT-KA or IAABC-certified)
- Can dedicate 45–90 minutes daily to exercise — structured walks, swimming (excellent low-impact exercise for giant breeds), and mental enrichment
- Have children aged 6+ who understand how to interact respectfully with a very large dog (toddlers can be accidentally knocked over by a 100-lb dog's tail wag)
- Live in a climate with cool to moderate temperatures — both parent breeds overheat easily in hot, humid conditions
- Have budgeted realistically for giant-breed lifetime costs ($15,000–$25,000+ over an 8–12 year lifespan)
- Live in an apartment or rental with weight restrictions
- Work long hours away from home (both parent breeds are prone to separation distress)
- Have very young children who could be injured by an exuberant, oversized puppy
- Are a first-time dog owner without access to professional training support
- Cannot tolerate heavy shedding, drool, and the general "messiness" of giant breeds
- Live in a hot climate without reliable air conditioning
If you're drawn to the temperament profile but need a smaller dog, consider a Labrador Retriever mixed with a smaller calm breed (such as a Basset Hound or English Springer Spaniel), or look into adopting a mid-size mixed breed from a local shelter or rescue where you can meet the adult dog and assess temperament directly rather than guessing at puppy outcomes.
Frequently Asked Questions
What two breeds make up the St Bernard and Lab mix?
This is a cross between a purebred Labrador Retriever (sporting group, originally from Newfoundland, Canada) and a purebred Saint Bernard (working group, originally from the Swiss/Italian Alps). It is not recognized as a distinct breed by the AKC but may be registered with designer breed registries like the American Canine Hybrid Club (ACHC) or Designer Dogs Kennel Club (DDKC).
How big will a St Bernard and Lab mix get?
Adult weight ranges from approximately 65 lb to over 160 lb (29–73+ kg), with most individuals landing in the 90–130 lb range. Height at the shoulder typically falls between 22 and 30 inches (56–76 cm). Males tend toward the larger end. You cannot reliably predict adult size until the dog is roughly 8–12 months old, though paw size and growth-plate assessments by your veterinarian at 16 weeks can offer rough estimates.
What will the temperament be like?
Expect a dog that is people-oriented, generally friendly, and moderately to highly trainable — but with significant individual variation. The best outcomes combine the Labrador's willingness to work with the Saint Bernard's steady calm. Challenging outcomes may include high-energy pulling on leash, stubbornness during training, or mouthiness. Early socialization (3–14 weeks) and consistent positive reinforcement training are essential regardless of which temperament your dog inherits.
Is the St Bernard and Lab mix hypoallergenic or low-shedding?
No. Neither parent breed carries genes for a hypoallergenic or low-shedding coat. This mix will shed moderately to heavily year-round, with intensified shedding during spring and fall coat blows. Regular brushing (2–3 times weekly minimum, daily for rough-coated individuals) is required. If you need a low-allergen dog, look at Poodle-based mixes instead.
What health issues might this mix inherit?
The primary concerns are hip dysplasia, elbow dysplasia, gastric dilatation-volvulus (bloat), dilated cardiomyopathy, and osteosarcoma — all conditions with known prevalence in one or both parent breeds. Responsible breeding with health-tested parents reduces (but does not eliminate) these risks. Pet insurance is strongly recommended given the high cost of treating orthopedic and oncological conditions in giant breeds.
How much does a St Bernard and Lab mix cost?
From a reputable breeder, expect to pay $800–$2,000 for an F1 puppy. Rescue adoptions range from $50–$500. First-year total ownership costs (including food, veterinary care, supplies, and preventive medications) typically fall between $2,800 and $5,500. Lifetime costs over an 8–12 year lifespan are estimated at $15,000–$25,000+, with potential for significantly higher expenses if major health conditions develop.
What is the lifespan of a St Bernard and Lab mix?
Expect approximately 9–12 years, which is typical for giant-breed dogs. The Labrador parent's longer lifespan (11–13 years) may slightly extend the mix's longevity compared to a purebred Saint Bernard (8–10 years), but giant size itself is a limiting factor. Maintaining a lean body condition score (BCS 4–5 out of 9) throughout life is the single most impactful thing you can do to maximize your dog's healthy years.
Robin Maitland
All our authors care for dogs every day — read more of their work on the authors page.
