St Bernard and Great Pyrenees Mix: The Saint Pyrenees Breed Guide
Complete guide to the St Bernard and Great Pyrenees mix (Saint Pyrenees). Covers size, temperament, coat types, health risks, grooming, and cost for
Meet the Saint Pyrenees: Two Giant Breeds, One Massive Companion
If you've been researching the St Bernard and Great Pyrenees mix — sometimes called the Saint Pyrenees — you're looking at one of the largest designer crosses in existence. This isn't a casual lap dog situation. We're talking about a dog that can weigh as much as a fully grown adult human, with a coat that could fill a laundry basket every shedding season and a heart roughly the size of a dinner plate.
This cross combines the St Bernard, the legendary Swiss Alpine rescue dog, with the Great Pyrenees, the French mountain livestock guardian. Both parent breeds are giant, cold-weather working dogs with deep histories of protecting and saving humans. The resulting mix inherits a blend of gentle giant temperament, heavy shedding, and some serious health considerations you need to understand before bringing one home.
Let's break down exactly what you're signing up for — including the parts most breeders won't emphasize in their listings.
The Parent Breeds: What You're Working With
Understanding a mixed breed starts with understanding the genetics you're rolling the dice on. Both parent breeds share some traits (giant size, thick double coats, cold-weather origins) but differ significantly in working style and temperament nuances.
| Trait | St Bernard | Great Pyrenees |
|---|---|---|
| Origin | Swiss Alps — hospice rescue dog | Pyrenees Mountains (France/Spain) — livestock guardian |
| AKC Weight Range | 120–180 lb (54–82 kg) | 85–160+ lb (39–73+ kg) |
| AKC Height | 26–30 in (66–76 cm) | 25–32 in (64–81 cm) |
| Primary Working Style | Search and rescue, draft work | Independent livestock guarding |
| Temperament | Outgoing, eager, people-oriented | Calm, independent, wary of strangers |
| Barking Level | Moderate | High — bred to bark at predators |
| Coat | Short or long; dense double coat | Long, thick, weather-resistant double coat |
| Lifespan | 8–10 years | 10–12 years |
The key takeaway: St Bernards tend to be more socially oriented and trainable, while Great Pyrenees are more independent thinkers with stronger guarding instincts. Your mix could land anywhere on that spectrum — and sometimes you get both extremes in one dog.
Generations Explained: F1, F1B, and Beyond
Generation Quick Reference
- F1 (First Generation): One purebred St Bernard × one purebred Great Pyrenees. Maximum genetic diversity, but most unpredictable trait expression.
- F1B (Backcross): An F1 Saint Pyrenees bred back to one of the parent breeds. Slightly more predictable — e.g., an F1B bred back to a Great Pyrenees will lean heavier into guardian traits and likely have a more Pyrenees-like coat.
- F2 (Second Generation): Two F1 Saint Pyrenees bred together. This is where trait variation can become more unpredictable, not less, because recessive genes from both parent breeds recombine in unexpected ways.
- Multigen (F3+): Multiple generations of Saint Pyrenees bred to Saint Pyrenees. Theoretically more consistent, but this cross is rare enough that established multigen lines barely exist as of 2026.
Reality check: Most Saint Pyrenees dogs you'll encounter are F1 crosses — often accidental breedings or small-scale breeder experiments. Established multigen lines for this particular mix are extremely uncommon.
Unlike Goldendoodles or Labradoodles, the Saint Pyrenees hasn't developed a robust multigen breeding community. This means you're almost always looking at F1 puppies, which carry the widest trait variability.
Size and Physical Traits: How Big Will a Saint Pyrenees Get?
Short answer: very, very big. But the exact numbers depend on which parent your individual dog favors, their sex, and their specific genetic lottery.
| Measurement | Low End (Pyrenees-Leaning Female) | High End (St Bernard-Leaning Male) |
|---|---|---|
| Weight | 85–110 lb (39–50 kg) | 150–200+ lb (68–91+ kg) |
| Height at Shoulder | 25–28 in (64–71 cm) | 29–33 in (74–84 cm) |
| Body Length | 36–42 in (91–107 cm) | 42–50 in (107–127 cm) |
| Time to Full Size | 18–24 months | 24–36 months |
Giant breeds grow slowly. Don't expect your Saint Pyrenees to reach full skeletal maturity until at least 18 months, and they may continue filling out in chest and muscle mass until age 3. This slow growth matters for joint health — overfeeding a giant-breed puppy to "maximize size" is one of the fastest ways to trigger developmental orthopedic disease.
Feed a large-breed puppy formula that meets AAFCO guidelines for large breeds (calcium capped at approximately 1.2–1.5% on a dry matter basis) and keep your puppy lean through growth phases. Your vet can track body condition score (BCS) to confirm appropriate growth rates.
Coat Types and Grooming: The Shedding Reality
Here's where individual variation really shows. Your Saint Pyrenees could inherit:
- Long, flowing Pyrenees-type coat: White or cream with possible badger markings, feathering on legs and tail, heavy undercoat. Requires brushing 3–4 times weekly minimum.
- Medium-length St Bernard-type coat: Red/white, mahogany/white, or brindle. Dense but slightly shorter than the Pyrenees coat. Still a heavy shedder.
- Short-coated St Bernard variant: Less common in this cross since the Pyrenees always contributes long-coat genes, but F1s can produce surprisingly short, dense coats with heavy undercoat.
Is the Saint Pyrenees Hypoallergenic or Low-Shedding?
No. Absolutely not. Neither parent breed is low-shedding. Both are double-coated cold-weather breeds that blow their undercoat at least once or twice per year in spectacular fashion. During shedding season (typically spring and fall), expect to remove enough undercoat in a single grooming session to stuff a standard pillow. If you have dog allergies, this is not the mix for you.
Grooming requirements by coat type:
| Coat Type | Weekly Brushing | Shedding Season | Professional Grooming |
|---|---|---|---|
| Long (Pyrenees-dominant) | 3–4 sessions, 20–30 min each | Daily de-shedding for 2–4 weeks | Optional; $80–$150 per session for giant breeds |
| Medium (blended) | 2–3 sessions, 15–20 min each | Every other day for 2–3 weeks | Usually manageable at home |
| Short (St Bernard-dominant) | 1–2 sessions, 10–15 min each | Every other day for 2–3 weeks | Rarely needed |
Essential tools: a slicker brush for the topcoat, an undercoat rake (the Furminator-style de-shedding tools work but use gently to avoid skin irritation), and a stainless steel comb for checking for mats behind the ears and in the armpits. Never shave a double-coated dog — it damages the coat's thermoregulation and can lead to permanent coat loss (post-clipping alopecia).
Temperament: Best-Case and Challenging Scenarios
The temperament of a Saint Pyrenees is where the genetic coin flip matters most. Both breeds are gentle with family members, but their working instincts diverge in ways that create very different daily living experiences.
Best-Case Scenario
You get a dog that combines the St Bernard's outgoing friendliness with the Pyrenees' calm steadiness. This dog greets visitors warmly (or at least politely), is patient with children, settles quietly indoors, barks only when genuinely alerting, and responds well to training with food motivation. They're a giant, gentle presence who leans against your legs and snores on the couch.
Challenging Scenario
You get a dog with strong Pyrenees guarding instincts and St Bernard stubbornness. This dog barks at everything — delivery drivers, neighbors, wind-blown leaves, shadows at 2 AM. They're standoffish with strangers and may position themselves between you and guests. Training is a negotiation rather than a collaboration. They're not aggressive, but their size means even friendly jumping or leaning becomes a liability with small children or elderly visitors.
Trait Variability Breakdown
| Trait | St Bernard End | Great Pyrenees End | Most Common in Mix |
|---|---|---|---|
| Stranger friendliness | Very friendly | Reserved, watchful | Moderately friendly after warm-up |
| Trainability | Moderate — food-motivated | Low — independent thinker | Moderate, but slow to respond to recalls |
| Barking | Moderate | High (especially nocturnal) | Moderate to high |
| Guarding instinct | Low | Strong | Moderate — alert but rarely aggressive |
| Separation tolerance | Poor — prone to distress | Good — bred to work alone | Variable; early conditioning critical |
| Energy level | Low to moderate | Low (with bursts of patrol energy) | Low — 30–60 min daily exercise sufficient |
Early socialization is non-negotiable with this mix. Expose your puppy to diverse people, environments, sounds, and other dogs between 8 and 16 weeks of age. Giant breeds that develop fear-based reactivity are exponentially harder to manage than a reactive Chihuahua — physics is not on your side. Enroll in a force-free, positive reinforcement puppy class; avoid any trainer who recommends prong collars, shock collars, or "dominance" techniques, which can damage trust and escalate fear responses in giant breeds.
Health Considerations: The Hybrid Vigor Myth and Real Risks
Let's address a pervasive misconception first: hybrid vigor does not guarantee a healthier dog. The concept of heterosis (hybrid vigor) has some scientific basis — crossbreeding can reduce the risk of recessive genetic diseases that are concentrated within closed breed populations. However, it does not protect against conditions that both parent breeds share. And with two giant breeds, the shared health risks are substantial.
Always consult your veterinarian about screening and preventive care for your individual dog. The following conditions appear in both St Bernards and Great Pyrenees and should be on your radar:
| Condition | Description | Prevalence in Parent Breeds | Screening / Prevention |
|---|---|---|---|
| Hip Dysplasia | Malformation of the hip joint leading to arthritis | St Bernard: ~47% affected (OFA data); Pyrenees: ~18% | OFA/PennHIP screening of parents; maintain lean weight |
| Elbow Dysplasia | Developmental abnormality of the elbow joint | St Bernard: ~20%; Pyrenees: ~8% | OFA elbow radiographs of parents |
| Gastric Dilatation-Volvulus (Bloat) | Life-threatening stomach torsion; deep-chested breeds at highest risk | Both breeds: high risk | Prophylactic gastropexy during spay/neuter; slow-feed bowls; no exercise 1 hr before/after meals |
| Dilated Cardiomyopathy (DCM) | Heart muscle weakening leading to heart failure | St Bernard: elevated risk; Pyrenees: moderate | Annual cardiac exams; echocardiogram if symptomatic |
| Osteosarcoma | Aggressive bone cancer | St Bernard: among highest-risk breeds; Pyrenees: elevated | No reliable screening; monitor for lameness or swelling |
| Hypothyroidism | Underactive thyroid gland | Both breeds: moderate prevalence | Annual thyroid panel (T4, free T4, TSH) |
Bloat deserves special attention. Both St Bernards and Great Pyrenees are among the breeds at highest risk for GDV (gastric dilatation-volvulus). According to Merck Veterinary Manual, deep-chested giant breeds have a lifetime risk estimated between 5–24%. Discuss a prophylactic gastropexy (surgically tacking the stomach to the abdominal wall) with your veterinarian when scheduling your dog's spay or neuter. This procedure reduces the recurrence risk of torsion by over 95% and can be performed laparoscopically.
Bloat emergency red flags: unproductive retching (trying to vomit but nothing comes up), distended abdomen, restlessness, excessive drooling, pale gums, collapse. This is a surgical emergency — you have hours, not days. Know the location of your nearest 24-hour emergency veterinary hospital before you need it.
Cost and Availability: What You'll Actually Spend
The Saint Pyrenees is an uncommon designer cross, which creates an unusual pricing situation. You're not paying the premium that established designer breeds like Bernedoodles command, but you're also not finding these puppies at every breeder's website.
| Expense Category | Estimated Range (2026) |
|---|---|
| Puppy purchase (breeder) | $800–$2,500 |
| Rescue/adoption fee | $200–$600 |
| First-year veterinary care | $800–$1,500 (vaccines, spay/neuter, heartworm, screening) |
| Food (giant-breed formula) | $120–$200/month ($1,440–$2,400/year) |
| Heartworm + flea/tick prevention | $300–$600/year (dosed by weight; giant breeds cost more) |
| Grooming supplies / professional grooming | $200–$800/year |
| XL crate (48–54 inch) | $120–$250 |
| Orthopedic bed (giant size) | $150–$350 |
| Pet insurance (giant breed) | $80–$150/month |
Realistic first-year total: $4,000–$8,000 depending on purchase price, your region, and whether you encounter any health issues. Ongoing annual costs after year one: $2,500–$5,000.
Finding a Saint Pyrenees: Dedicated breeders for this specific cross are rare. You'll more commonly find them through:
- Small-scale hobby breeders who breed one of the parent breeds and occasionally cross
- Accidental litters listed on regional classifieds (exercise extreme caution — verify health testing of both parents)
- Large-breed or giant-breed rescue organizations — both St Bernards and Great Pyrenees frequently end up in rescue due to their size and exercise/grooming needs overwhelming unprepared owners
- Breed-specific rescues: Saint Bernard Rescue Foundation and Great Pyrenees Rescue networks occasionally have mixed-breed dogs
When evaluating a breeder, require proof of OFA hip and elbow scores for both parent dogs, cardiac screening, and a written health guarantee with a take-back clause. A responsible breeder will also ask you questions about your living situation, experience with giant breeds, and yard setup.
Who This Mix Suits Best (and Who Should Pass)
The Saint Pyrenees isn't a dog for everyone. Here's a practical decision framework:
This mix is a strong fit if you:
- Have experience with giant breeds or large working dogs
- Live in a house with a securely fenced yard (minimum 6-foot fence; these dogs can be wanderers)
- Live in a cool or moderate climate — both breeds suffer in sustained heat above 85°F (29°C)
- Have time for daily grooming sessions and don't mind dog hair as a permanent home décor element
- Want a calm, low-energy companion rather than a hiking or agility partner
- Have a budget that accommodates giant-breed food, medication, and veterinary costs
- Are committed to early socialization and ongoing positive reinforcement training
Consider a different breed if you:
- Live in an apartment or have landlord breed/size restrictions
- Are a first-time dog owner without mentorship from experienced handlers or trainers
- Live in a hot climate (southern US summers are dangerous for this mix)
- Have young toddlers — not because the dog is aggressive, but because a 150-lb dog can accidentally knock over a 25-lb child
- Cannot tolerate nocturnal barking (Pyrenees heritage can mean nighttime vocalizing)
- Want a dog that reliably comes when called off-leash — both breeds have independent streaks
- Have a tight budget — giant breeds are expensive at every level of care
Frequently Asked Questions
What two breeds make up the Saint Pyrenees?
The Saint Pyrenees is a cross between a St Bernard and a Great Pyrenees. Both are giant, cold-weather working breeds — the St Bernard from the Swiss Alps (bred for search and rescue) and the Great Pyrenees from the French/Spanish Pyrenees Mountains (bred as a livestock guardian).
How big will a St Bernard and Great Pyrenees mix get?
Expect a weight range of 85–200+ lb (39–91+ kg) and a shoulder height of 25–33 inches (64–84 cm). Males tend to be significantly larger. Full physical maturity takes 2–3 years for giant breeds.
What will the temperament be like?
Variable. Most Saint Pyrenees dogs are calm, gentle with family, and moderately friendly with strangers after a warm-up period. Some lean toward the Pyrenees' independent guarding nature and may be more reserved, bark more, or be harder to train. Early socialization and positive reinforcement training are essential regardless of which direction your dog leans.
Is this mix hypoallergenic or low-shedding?
No. Both parent breeds are heavy-shedding, double-coated dogs. Expect significant year-round shedding with intense seasonal coat blows in spring and fall. This mix is not suitable for people with dog allergies.
What health issues might this mix inherit?
The most significant shared risks include hip dysplasia, elbow dysplasia, gastric dilatation-volvulus (bloat), dilated cardiomyopathy, osteosarcoma, and hypothyroidism. Request OFA screening documentation for both parent dogs before purchasing a puppy, and discuss a prophylactic gastropexy with your veterinarian.
How much does a St Bernard and Great Pyrenees mix cost?
Puppies from breeders typically range from $800 to $2,500, though this cross is uncommon and availability is limited. Rescue adoption fees range from $200 to $600. Factor in $4,000–$8,000 for first-year expenses including food, veterinary care, supplies, and preventive medications sized for a giant breed.
Are Saint Pyrenees good with children?
Generally yes — both parent breeds are known for patience with children. However, the sheer size of these dogs creates accidental injury risk with toddlers and small children. Always supervise interactions, and teach children not to climb on, ride, or startle the dog. The dog's tolerance doesn't eliminate the physics of a 150-lb animal moving through a room.
Can a Saint Pyrenees live in an apartment?
Technically possible but not recommended. These dogs need space to move comfortably, and most apartment complexes have weight restrictions (often 50–80 lb limits) that would exclude this breed. Even without restrictions, navigating stairs and tight hallways with a 150-lb dog becomes a daily challenge, and the barking tendencies inherited from the Pyrenees side will not endear you to neighbors.
Robin Maitland
All our authors care for dogs every day — read more of their work on the authors page.
