Border Collie Aussie Mix: The Complete Borador Breed Guide
Everything you need to know about the Border Collie Aussie mix — size, temperament, coat types, health risks, grooming, costs, and whether this...
What Is a Border Collie Aussie Mix?
The Border Collie Aussie mix — sometimes called the Aussie Collie or, less commonly, the Borador (not to be confused with the Lab-border collie cross that shares the same nickname) — is a first-generation or multigenerational cross between two of the most intelligent, driven herding breeds in the world: the Border Collie and the Australian Shepherd.
This is not an AKC-recognized breed. It's a designer cross, which means there is no breed standard governing appearance, size, or temperament. Every individual dog is a genetic roll of the dice. What you get is a dog that inherits traits from two remarkably similar working-line parents — which makes some characteristics fairly predictable (high energy, high intelligence, strong herding instinct) while others remain highly variable (coat color, ear set, exact size, eye color).
If you're considering this mix, understand up front: you are signing up for one of the most mentally and physically demanding companion dogs available. These dogs are not couch pets. They thrive with jobs, structured activity, and experienced handlers who understand herding-dog psychology.
Parent Breed Breakdown
Before predicting what a Border Collie Aussie mix might look and act like, you need to understand the two parent breeds. Both are herding dogs, but they have distinct histories and tendencies.
| Trait | Border Collie | Australian Shepherd |
|---|---|---|
| Origin | Anglo-Scottish border region, 1800s | Western United States, late 1800s (despite the name, not from Australia) |
| AKC Weight Range | 30–55 lb (14–25 kg) | 40–65 lb (18–29 kg) |
| AKC Height Range | 18–22 in (46–56 cm) | 18–23 in (46–58 cm) |
| Primary Working Style | "Strong-eyed" herder — uses intense stare to control livestock at a distance | "Loose-eyed" herder — works closer to stock, more physical, uses body pressure |
| Energy Level | Very high — needs 90–120+ min of vigorous daily activity | High — needs 60–90+ min of vigorous daily activity |
| Coat Type | Rough (medium-long) or smooth (short); double coat | Medium-length; double coat; moderate feathering |
| Shedding | Moderate year-round, heavy seasonal blow | Moderate year-round, heavy seasonal blow |
| Typical Lifespan | 12–15 years | 12–15 years |
| Notable Genetic Risks | MDR1 mutation, collie eye anomaly (CEA), hip dysplasia, epilepsy | MDR1 mutation, hip dysplasia, hereditary cataracts, epilepsy, merle-related deafness/blindness |
Both breeds share the MDR1 (multi-drug resistance 1) gene mutation, which causes dangerous sensitivity to common medications including ivermectin, loperamide (Imodium), and certain sedatives. According to Merck Veterinary Manual, approximately 75% of Collies and 50% of Australian Shepherds carry at least one copy of this mutation. Your Border Collie Aussie mix has a meaningful probability of inheriting it — genetic testing through Washington State University's Veterinary Clinical Pharmacology Lab costs around $70–$100 and should be done before any medication is administered.
Understanding Generations: F1, F1B, F2, and Multigen
Generation Guide for Border Collie Aussie Mixes
- F1 (First Generation): One purebred Border Collie × one purebred Australian Shepherd. Maximum genetic diversity. Traits are the most variable — puppies in the same litter can look dramatically different.
- F1B (First Generation Backcross): An F1 Border Collie Aussie mix bred back to one of the parent breeds (e.g., F1 mix × purebred Border Collie). This skews traits toward the backcross parent — useful if you want more predictability in size or coat.
- F2 (Second Generation): Two F1 Border Collie Aussie mixes bred together. This is where trait predictability actually decreases — you get wider variation because recessive genes from both grandparent breeds recombine in unpredictable ways.
- Multigen (F3+): Multiple generations of Border Collie Aussie mixes bred together. After 3–4 generations, some trait stabilization occurs, but without a formal breed standard and registry, consistency remains far lower than in purebred dogs.
Most Border Collie Aussie mixes available from breeders are F1 crosses. Multigen lines are uncommon because both parent breeds are readily available, making F1 production straightforward.
Size Range: How Big Will a Border Collie Aussie Mix Get?
Because both parent breeds fall in a similar size bracket, the Border Collie Aussie mix tends to land in a reasonably predictable range — though individual dogs can fall outside these bounds, particularly if one parent was an unusually large or small specimen.
| Measurement | Small End of Range | Average | Large End of Range |
|---|---|---|---|
| Weight (females) | 30 lb (14 kg) | 40–45 lb (18–20 kg) | 55 lb (25 kg) |
| Weight (males) | 35 lb (16 kg) | 45–55 lb (20–25 kg) | 65 lb (29 kg) |
| Height at shoulder | 18 in (46 cm) | 19–21 in (48–53 cm) | 23 in (58 cm) |
Puppies typically reach their full height by 12–14 months but continue filling out in chest and muscle mass until 18–24 months. If you're adopting a puppy, ask the breeder for the exact weight and height of both parents — this gives you the best predictor of adult size.
Coat Type, Color, and Shedding
This is where variability is most visible. A Border Collie Aussie mix can inherit any combination of the following:
Coat Texture Possibilities
- Medium-length double coat (most common) — moderate feathering on legs, chest, and tail. Inherits from both parents equally.
- Rough/long coat — longer feathering, more pronounced mane around the neck. Leans toward the Border Collie parent's rough-coat gene.
- Smoother/shorter coat — less feathering, easier maintenance. Inherits from smooth-coat Border Collie lines.
Color Possibilities
Both parent breeds carry genes for a wide color palette. Expect any of the following: black tri (black, white, tan), red tri (liver, white, tan), blue merle, red merle, black and white, red and white, sable, or solid black/red. White markings (blaze, collar, socks) are extremely common and inherited from both sides.
Is This Mix Hypoallergenic or Low-Shedding?
No. Neither parent breed is hypoallergenic or low-shedding. Both are double-coated dogs with moderate year-round shedding and intense seasonal coat blows (typically spring and fall). A Border Collie Aussie mix will shed consistently and will require regular grooming. If you have dog allergies, this is not a suitable mix. There is no generation or backcross that changes this — the low-shedding gene simply doesn't exist in either parent breed.
Eye Color
One distinctive trait this mix can inherit is heterochromia (two different-colored eyes) or partial heterochromia (marbled or split-color within a single eye). This is particularly common in merle-colored dogs and is inherited from the Australian Shepherd side. It's a cosmetic trait with no health impact in non-merle dogs, but double-merle breedings (merle × merle) carry serious risks of deafness and blindness — responsible breeders never pair two merle dogs.
Temperament: What to Expect (and What to Prepare For)
Temperament in a Border Collie Aussie mix falls along a spectrum. Both parent breeds share core traits — intelligence, work drive, sensitivity, and herding instinct — but the intensity and expression vary by individual.
Best-Case Scenario
A well-socialized Border Collie Aussie mix from stable, health-tested parents is an extraordinarily responsive, eager-to-learn companion. These dogs excel at agility, obedience, rally, disc sports, nose work, and herding trials. They form deep bonds with their handlers, are typically biddable (willing to follow direction), and can learn complex multi-step commands. In a structured home with daily physical and mental work, they are calm indoors and attentive outdoors.
Challenging Scenario
Without sufficient exercise and mental stimulation, these dogs develop problem behaviors rapidly. Expect:
- Hyperactivity and inability to settle — pacing, whining, door-dashing
- Destructive chewing — targeting furniture, shoes, walls, and door frames
- Herding behavior toward children, cats, or cars — nipping at heels, chasing, body-blocking
- Reactivity on leash — barking and lunging at other dogs, joggers, or bicycles
- Sound sensitivity and anxiety — both parent breeds are known for noise phobias (thunderstorms, fireworks)
- Obsessive behaviors — shadow-chasing, light-fixation, tail-chasing (particularly from Border Collie lines with high working-drive genetics)
These are not "bad dogs" — they are understimulated dogs expressing normal herding-breed behaviors in an environment that doesn't meet their needs. The fix is management, exercise, and training using positive reinforcement and force-free methods. Aversive tools like shock collars, prong collars, or alpha rolls are counterproductive with sensitive herding breeds and can escalate anxiety-based behaviors.
Socialization Window
The critical socialization period for puppies ends around 14–16 weeks. If you're getting a Border Collie Aussie mix puppy, plan structured exposure to 50–100 novel stimuli (surfaces, sounds, people types, other animals, environments) before 16 weeks of age. The American Veterinary Society of Animal Behavior (AVSAB) recommends beginning socialization as early as 7–8 weeks, even before the full vaccination series is complete, in controlled, low-risk environments.
Health Considerations: Hybrid Vigor vs. Reality
Let's address a persistent myth: "hybrid vigor" does not eliminate health issues in designer crosses. The concept of heterosis (hybrid vigor) is real in genetics — it primarily applies to traits governed by many genes (polygenic traits) like fertility, growth rate, and immune function. However, most of the serious inherited diseases in Border Collies and Australian Shepherds are caused by recessive mutations shared by both breeds. Crossing them does not magically avoid these conditions.
Inherited Conditions to Screen For
| Condition | Description | Prevalence in Parent Breeds | Available Screening Test |
|---|---|---|---|
| MDR1 Drug Sensitivity | Mutation in the ABCB1 gene causing toxic reactions to common drugs (ivermectin, loperamide, acepromazine, vincristine) | ~50% Aussies, ~75% Collies carry at least one copy | WSU Veterinary Clinical Pharmacology Lab DNA test ($70–$100) |
| Hip Dysplasia | Malformation of the hip joint leading to arthritis, pain, and lameness | ~6–12% in both breeds per OFA data | OFA or PennHIP radiographic evaluation (parents should be tested) |
| Collie Eye Anomaly (CEA) | Congenital eye defect ranging from mild choroidal hypoplasia to retinal detachment and blindness | ~2–5% in Border Collies; less common in Aussies but present | DNA test available; CERF/OFA ophthalmologist exam |
| Hereditary Cataracts | Progressive lens opacity causing vision loss; particularly prevalent in Australian Shepherds | ~5–10% in Aussies (HSF4 gene mutation) | HSF4 DNA test; annual CERF eye exam |
| Epilepsy (Idiopathic) | Recurring seizures with no identifiable structural cause; onset typically 6 months–5 years | Estimated 2–5% in both breeds | No definitive DNA test; diagnosis by exclusion through veterinary neurology workup |
| Merle-Related Deafness/Blindness | Double-merle dogs (inheriting merle from both parents) have high rates of congenital deafness and ocular defects | ~25% of double merles are deaf; ~10% blind | BAER hearing test; ophthalmologist exam; breeders must avoid merle × merle pairings |
Key takeaway: Ask any breeder for documented health clearances on both parent dogs — not just "vet checked" (which means little), but actual OFA hip scores, CERF eye exams, MDR1 DNA results, and CEA/cataract DNA results. Reputable breeders will provide these willingly. If they can't or won't, walk away.
Always consult your veterinarian to establish a preventive health plan for your Border Collie Aussie mix, including appropriate medication safety based on MDR1 status.
Grooming Needs
Most Border Collie Aussie mixes inherit a medium-length double coat that requires consistent maintenance:
- Brushing: 2–3 times per week with a slicker brush and undercoat rake. During seasonal coat blows (spring and fall), daily brushing for 2–3 weeks prevents matting and reduces household shedding.
- Bathing: Every 6–8 weeks, or as needed. Use a dog-specific shampoo — human products disrupt canine skin pH (dogs sit around 6.2–7.4 pH vs. human skin at ~5.5).
- Nail trimming: Every 2–4 weeks. Active dogs on hard surfaces may wear nails naturally, but most still need regular trims.
- Ear cleaning: Check weekly; clean with a veterinarian-recommended ear cleaner if debris accumulates. Floppy-eared individuals (inherited from the Aussie side) are more prone to ear infections.
- Dental care: Daily tooth brushing with enzymatic dog toothpaste. Both parent breeds are susceptible to periodontal disease by age 3–5 without home dental care.
Never shave a double-coated dog. The undercoat provides insulation against both heat and cold. Shaving disrupts the coat's thermoregulatory function and can cause permanent coat damage (post-clipping alopecia), where the hair grows back patchy, cottony, or not at all.
Exercise and Mental Stimulation Requirements
Plan for a minimum of 90–120 minutes of structured physical activity daily, plus additional mental work. A typical day might look like:
- Morning: 30–45 minute off-leash hike or fetch session in a secure area
- Midday: 15–20 minute training session (new tricks, obedience refinement, scent work)
- Afternoon: 30–45 minute structured walk with sniffing opportunities
- Evening: Puzzle feeder for dinner, 10–15 minute trick-training or agility practice
Physical exercise alone is not enough. Herding breeds need cognitive challenges — without them, they create their own "jobs" (herding your children, patrolling windows obsessively, dismantling furniture). Budget for enrichment tools: snuffle mats ($15–$30), puzzle feeders like the Kong Wobbler ($15–$20) or Outward Hound Nina Ottosson puzzles ($15–$35), flirt poles ($25–$45), and agility equipment if space allows.
Cost: What You'll Pay for a Border Collie Aussie Mix
| Source | Price Range | What's Typically Included |
|---|---|---|
| Responsible breeder (health-tested parents) | $800–$2,000 | Health clearances on parents, first vaccinations, deworming, microchip, early socialization protocol, take-back clause |
| Backyard breeder / online marketplace | $300–$800 | Variable — often no health testing, minimal veterinary care, no take-back guarantee |
| Breed-specific rescue | $200–$500 | Spay/neuter, vaccinations, microchip, basic behavioral assessment; Border Collie and Aussie rescues frequently have mixes |
| General shelter | $50–$300 | Spay/neuter, vaccinations, microchip; identification as "Border Collie mix" or "Aussie mix" is often a best-guess visual assessment |
First-Year Budget Estimate
Beyond the purchase price, budget realistically for first-year expenses:
- Veterinary care (initial exams, vaccine series, spay/neuter if not included): $500–$1,200
- Food (high-quality kibble, ~25–35 lb/month for a 40–55 lb dog): $480–$900/year
- Preventive medications (heartworm, flea/tick — e.g., Simparica Trio, Interceptor Plus): $200–$400/year
- Supplies (crate, bed, leash, harness, bowls, grooming tools, enrichment toys): $300–$600
- Training classes (group puppy class + intermediate obedience): $200–$500
- Pet insurance (optional but recommended for herding breeds): $400–$800/year
Total first-year estimate: $2,100–$4,400+ on top of the purchase/adoption price.
Who This Mix Suits Best
Ideal Owner Profile
- Active adult or family with older children (8+ years — herding instinct toward toddlers can result in nipping)
- Experience with herding breeds or high-drive working dogs
- Access to a securely fenced yard (minimum 4-foot fence; these dogs are athletic climbers and jumpers)
- Available time: 2+ hours daily for exercise, training, and engagement
- Interest in dog sports (agility, herding, obedience, disc) as structured outlets
- Patient temperament — these dogs are sensitive and shut down under harsh handling
Poor Fit — Consider a Different Breed If:
- You work 10+ hour days and the dog will be alone for extended periods
- You live in an apartment with no outdoor access or nearby green space
- You have toddlers or very young children (herding instinct creates safety concerns)
- You want a low-maintenance, low-energy companion
- You're a first-time dog owner without support from a trainer or experienced mentor
- You have cats or small animals (prey drive and herding instinct can make multi-species households difficult, though not impossible with careful management)
Frequently Asked Questions
What two breeds make up the Border Collie Aussie mix?
A purebred Border Collie and a purebred Australian Shepherd. Both are AKC-recognized herding breeds with working-line and show-line variations that influence the mix's temperament and build.
How big will my Border Collie Aussie mix get?
Most adults weigh 35–55 lb (16–25 kg) and stand 18–22 inches (46–56 cm) at the shoulder. Males tend toward the larger end. The exact size depends on which parent the puppy favors and whether the parents were working-line (often leaner, lighter) or show-line (often stockier).
What will the temperament be like?
Expect high intelligence, strong handler focus, sensitivity, and pronounced herding instinct. Most are eager to learn and respond well to positive reinforcement training. However, intensity varies — some individuals are calmer "off-switch" dogs, while others are perpetual-motion machines that need constant engagement. Meeting both parent dogs gives you the best preview.
Is the Border Collie Aussie mix hypoallergenic?
No. Both parent breeds are moderate-to-heavy shedders with double coats. This mix sheds year-round and blows coat seasonally. There is no hypoallergenic version of this cross.
What health issues might this mix inherit?
The primary concerns are MDR1 drug sensitivity, hip dysplasia, collie eye anomaly (CEA), hereditary cataracts (HSF4 gene), idiopathic epilepsy, and — in merle-colored dogs from merle × merle breedings — congenital deafness and blindness. Request health clearances from the breeder and have your dog tested for MDR1 before any medications are administered.
How much does a Border Collie Aussie mix cost?
From a responsible breeder with health-tested parents, expect $800–$2,000. Rescue adoption fees range from $50–$500. Factor in $2,100–$4,400+ in first-year care costs regardless of source.
Can Border Collie Aussie mixes live in apartments?
It's possible but challenging. These dogs need 90–120 minutes of vigorous daily exercise plus mental stimulation. If you can commit to multiple daily outings, dog sports, and structured enrichment, some individuals adapt to apartment living. A house with a fenced yard is significantly easier for meeting this breed mix's needs.
Are Border Collie Aussie mixes good with children?
They can be excellent with older children (8+) who understand how to interact respectfully with dogs. However, their strong herding instinct often manifests as heel-nipping, circling, and body-blocking — behaviors that can frighten or knock over toddlers. Supervision is essential, and families with very young children may want to wait or choose a lower-drive breed.
Aaron Whyte
All our authors care for dogs every day — read more of their work on the authors page.
