Great Pyrenees Mix Border Collie: The Complete Pyr Collie Guide

If you've ever watched a Border Collie work a flock with laser focus and then seen a Great Pyrenees stand watch over lambs through a freezing night, you can understand why some breeders crossed these two working breeds. The result — often called the Pyr Collie or Pyrenees Collie — is a large, intelligent, fiercely loyal dog that combines herding instinct with guardian temperament. But this is not a beginner's dog, and the variability inherent in any mixed breed means no two Pyr Collies turn out exactly alike.

This guide breaks down everything prospective owners need to know about the Great Pyrenees mix Border Collie before bringing one home — from realistic size expectations and coat outcomes to the health screenings you should demand from any breeder.

Parent Breed Breakdown: Two Working Dogs, Two Very Different Jobs

Understanding the Pyr Collie starts with understanding the two breeds that create it. These are not companion dogs by origin — both were developed for demanding outdoor work, and those instincts carry forward into the mix.

The Border Collie is widely regarded as the most intelligent dog breed, capable of learning hundreds of words and commands. The Great Pyrenees, by contrast, is an independent thinker bred to make decisions without human direction — which often reads as stubbornness in a home setting. When you mix these two, you get a dog that is both brilliant and willful. That combination requires an owner who understands canine behavior and has the patience for positive reinforcement training methods.

How Big Will a Great Pyrenees Mix Border Collie Get?

This is one of the most common questions about the Pyr Collie, and the honest answer is: the range is wide. Because the parent breeds differ dramatically in size (a Border Collie might weigh 40 lb while a male Great Pyrenees can exceed 120 lb), the offspring can land almost anywhere in between.

In practice, most Pyr Collies lean toward the larger end if the Great Pyrenees parent was a big male, and toward the smaller end if the Border Collie parent contributed more genetically. F1 puppies from the same litter can vary by 15–20 lb at maturity. If size predictability matters to you — for example, if you live in an apartment with weight restrictions — this mix is a gamble.

According to AKC breed standards, Border Collies are a medium-sized breed, while Great Pyrenees are classified as giant. The offspring of this pairing will almost always be a large dog, but "large" can mean very different things at 55 lb versus 95 lb.

Coat, Shedding, and the Hypoallergenic Myth

The coat a Pyr Collie inherits depends on which parent's genes dominate, and there are several possible outcomes:

• Border Collie-dominant coat: Medium-length, smoother, with moderate feathering on legs and tail. Easier to manage but still sheds consistently.
• Great Pyrenees-dominant coat: Long, thick, dense undercoat with a weather-resistant outer coat. Requires significant grooming commitment and sheds heavily twice a year.
• Blended coat: Medium-to-long length with a dense undercoat. The most common outcome, and the most variable in texture.

Common color patterns include white with black or gray markings, white with tan or biscuit patches, tri-color, and merle (if the Border Collie parent carries the merle gene). The classic Great Pyrenees white coat often shows up in the mix, sometimes with the darker Border Collie markings appearing on the face, ears, or back.

Grooming Requirements

Regardless of which coat type your Pyr Collie inherits, plan for:

• Brushing: 3–4 times per week minimum with an undercoat rake and slicker brush. During seasonal shedding (spring and fall), daily brushing is necessary.
• Bathing: Every 6–8 weeks, or as needed. Over-bathing strips natural oils from the double coat.
• Professional grooming: Optional but helpful every 3–4 months for de-shedding treatments, especially if your dog has a Pyr-dominant coat.
• Never shave a double-coated dog. Shaving disrupts the coat's insulating structure and can cause permanent damage to regrowth. This is a common mistake that veterinary professionals regularly warn against.

Temperament: What to Expect (and What Might Surprise You)

The Pyr Collie temperament is where the "mix" factor creates the widest variation. Because the parent breeds have such different working styles and social behaviors, individual dogs can lean heavily toward one parent or display a blend that creates unique challenges.

Best-Case Temperament

A well-socialized Pyr Collie with a balanced temperament blend is calm and watchful at home (Pyrenees influence) but responsive and trainable during structured activities (Border Collie influence). These dogs bond deeply with their families, are gentle with children they're raised alongside, and make excellent watchdogs — alerting to visitors without becoming aggressive. They tend to be loyal without being clingy, and they can settle in the house when their exercise needs are met.

Challenging Temperament Scenarios

Less ideal outcomes include dogs that inherit the Border Collie's intense herding drive combined with the Pyrenees' territorial guarding instinct. This can manifest as:

• Nipping at children's heels or chasing running kids (herding instinct)
• Aggression toward unfamiliar dogs entering the property (guardian instinct)
• Excessive nighttime barking (Pyrenees are nocturnal barkers by breed design)
• Escape attempts and roaming (both breeds are known wanderers if not securely contained)
• Stubbornness during training (Pyrenees independence combined with Border Collie intelligence can create a dog who understands commands but chooses not to comply)

Early socialization — ideally starting before 12 weeks of age and continuing through the first year — is critical. Puppy kindergarten classes using positive reinforcement methods, exposure to varied people, surfaces, sounds, and other animals, and consistent reward-based training are non-negotiable for this mix.

Health Considerations: Hybrid Vigor vs. Reality

Here are the conditions that Pyr Collie owners should screen for and monitor:

What to ask a breeder: Request documentation of OFA hip and elbow scores for both parents, a current CERF or veterinary ophthalmologist eye exam, and DNA test results for CEA and the merle gene. A responsible breeder will provide these without hesitation. If a breeder tells you "mixed breeds don't need health testing," walk away.

For ongoing health management, consult your veterinarian about a large-breed puppy feeding protocol (to support controlled growth and reduce hip dysplasia risk), a bloat prevention plan, and an age-appropriate cancer screening schedule. According to the Merck Veterinary Manual, large and giant breeds benefit from joint supplements containing glucosamine and chondroitin starting in early adulthood.

Generation Types: F1, F1B, and Beyond

Most Pyr Collies available from breeders are F1 crosses, since this mix is not common enough to have established multigen breeding programs. The F1 generation tends to have the broadest health advantage from genetic diversity, but it also produces the least predictable puppies in terms of size, coat, and temperament.

Unlike Doodle breeds (which have extensive F1B and multigen lines), the Pyr Collie remains relatively niche. This means you're more likely to find F1 puppies from breeders who specialize in working-line Border Collies or Great Pyrenees and occasionally cross them — or, more commonly, you'll find this mix in rescues where the pairing was unplanned.

Cost, Availability, and Where to Find a Pyr Collie

The Great Pyrenees mix Border Collie is not a mainstream designer breed, which affects both pricing and availability.

First-year budget estimate: Beyond the purchase or adoption price, plan for $1,800–$3,500 in first-year costs including veterinary exams, vaccinations, spay/neuter (larger dogs cost more for this procedure), high-quality large-breed food ($60–$100/month for a 70+ lb dog), crate, fencing, training classes, grooming supplies, and pet insurance premiums ($50–$90/month for a large breed).

Adoption through a rescue is a strong option for this mix. Great Pyrenees rescues like the Great Pyrenees Rescue and Border Collie rescues regularly take in mixed-breed dogs. Adult dogs from rescue have the advantage of known temperament, size, and behavior — reducing the unpredictability that comes with Pyr Collie puppies.

Who Should (and Shouldn't) Get a Pyr Collie

This mix is not a good fit for everyone. Here's a practical framework for deciding:

This Mix Suits You If:

• You have a securely fenced yard (minimum 6-foot fence — both parent breeds are escape artists)
• You live in a rural or suburban area with space for a large, active dog
• You have prior experience with herding or guardian breeds
• You can commit to 60–90 minutes of daily physical and mental exercise
• You want a dog for outdoor activities: hiking, farm work, agility, or advanced obedience
• You have older children (10+) who understand how to interact respectfully with dogs
• You're prepared for heavy shedding and regular grooming

Look at a Different Breed If:

• You live in an apartment or have close neighbors sensitive to barking
• This is your first dog and you have no training experience
• You have toddlers or very young children (herding nipping and large size create safety risks)
• You work long hours away from home — this mix is prone to separation anxiety and destructive behavior when under-stimulated
• You want a low-shedding or hypoallergenic dog
• You're uncomfortable with a dog that may bark loudly and frequently, especially at night

Frequently Asked Questions

What two breeds make up the Great Pyrenees mix Border Collie?

The Pyr Collie is a cross between a purebred Border Collie (a medium-sized herding dog from the Anglo-Scottish border region) and a purebred Great Pyrenees (a giant livestock guardian breed from the mountainous border between France and Spain). The combination produces a large working dog with both herding and guarding instincts.

How big will this mixed breed get?

Most Pyr Collies weigh between 60 and 85 lb (27–39 kg) and stand 21 to 28 inches (53–71 cm) at the shoulder. However, individuals can range from as small as 50 lb to over 100 lb depending on which parent's genes dominate. Males tend to be larger. Full size is typically reached by 18–24 months.

What will the temperament be like?

Temperament varies widely. The best outcomes produce a calm, loyal, watchful dog that is trainable and bonds closely with family. More challenging outcomes include high prey drive, herding nipping, territorial aggression toward unfamiliar dogs, stubbornness, and excessive barking. Early socialization and consistent positive reinforcement training are essential regardless of temperament leaning.

Is this mix hypoallergenic or low-shedding?

No. Both parent breeds are heavy shedders with double coats. A Pyr Collie will shed year-round with intensified shedding during spring and fall coat blows. Daily brushing during peak shedding seasons is often necessary. This mix is not suitable for people with dog allergies.

What health issues might this mix inherit?

Key concerns include hip dysplasia, elbow dysplasia, Collie Eye Anomaly (CEA), bloat (gastric dilatation-volvulus), deafness (particularly in merle carriers), and osteosarcoma. Health screening both parent breeds through OFA radiographs, DNA tests, and veterinary ophthalmologist exams significantly reduces risk. Always consult your veterinarian about a preventive health plan tailored to your dog's size and breed background.

How much does this designer mix cost?

From a responsible breeder with health-tested parents, expect to pay $800–$2,000. Adoption through a rescue typically costs $200–$450. First-year total ownership costs (food, vet care, supplies, insurance, training) typically range from $1,800 to $3,500 on top of the purchase price.

Are Pyr Collies good with other pets?

It depends on socialization and individual instinct. The herding drive from the Border Collie side can make them chase cats or smaller animals, while the guardian instinct from the Pyrenees side can make them protective of their "flock" — which may include other household pets. Supervised introductions and early exposure to other species improve outcomes, but some Pyr Collies will always need management around small animals.

How much exercise does a Pyr Collie need?

Plan for 60–90 minutes of structured activity daily. This should include a mix of physical exercise (long walks, hiking, fetch, swimming) and mental stimulation (training sessions, puzzle toys, scent work, or herding trials if available). A bored Pyr Collie is a destructive Pyr Collie — they will dig, chew, bark, or attempt to escape if under-exercised.