Pitbull Mixed with a Bullmastiff: The Complete Pit Mastiff Breed Guide
Everything about the pitbull mixed with a bullmastiff: size, temperament, health risks, coat care, costs.
If you've encountered a dog with the muscular build of an American Pit Bull Terrier and the broad, imposing head of a Bullmastiff, you've likely met a Pit Mastiff — a designer cross that's gaining attention for its loyalty, strength, and surprisingly gentle nature with family. The pitbull mixed with a bullmastiff is not a breed recognized by the AKC, but it's a deliberate cross that combines two powerful guardian-type dogs into one substantial companion.
This guide breaks down what you can realistically expect from this mix — including the traits that are fairly predictable and the ones that vary wildly between individual dogs. Because with any mixed breed, genetics is a roll of the dice, and understanding both parent breeds is the only way to prepare.
The Two Parent Breeds: What Each Brings to the Table
Understanding a Pit Mastiff requires understanding both parent breeds in depth. Each contributes distinct physical and behavioral traits, and the resulting mix can lean heavily toward one parent or land somewhere in the middle.
| Trait | American Pit Bull Terrier | Bullmastiff |
|---|---|---|
| Weight Range | 30–65 lb (14–29 kg) | 100–130 lb (45–59 kg) |
| Height | 17–21 in (43–53 cm) | 24–27 in (61–69 cm) |
| Lifespan | 12–16 years | 7–9 years |
| Original Purpose | Bull-baiting, farm work, companionship | Estate guarding (gamekeeper's night dog) |
| Energy Level | High — 60–90 min exercise/day | Low to moderate — 30–45 min/day |
| Guard Instinct | Low — typically friendly with strangers | High — natural property guardian |
| Dog Tolerance | Variable — some dog-selective or dog-aggressive | Moderate — can be same-sex aggressive |
| AKC Recognition | Not AKC (UKC recognized); AmStaff is AKC | AKC Working Group |
The APBT contributes athleticism, tenacity, high pain tolerance, and strong human bonding. The Bullmastiff adds size, guarding instinct, a calmer baseline energy, and a more reserved demeanor with strangers. According to the AKC Bullmastiff breed standard, this breed was developed in 19th-century England by crossing Bulldogs with Mastiffs to create a dog that could silently track and pin poachers on large estates — not maul them, but hold them. That "hold and restrain" instinct can show up in a Pit Mastiff as a tendency to body-block or lean on people or other animals.
How Big Will a Pitbull Mixed with a Bullmastiff Get?
This is one of the most variable aspects of the mix, because the parent breeds differ dramatically in size. A first-generation (F1) Pit Mastiff can land anywhere across a wide spectrum depending on which parent's genes dominate and the sex of the dog.
| Category | Weight | Height at Shoulder |
|---|---|---|
| Small end (APBT-dominant) | 50–70 lb (23–32 kg) | 19–22 in (48–56 cm) |
| Mid-range (balanced mix) | 70–100 lb (32–45 kg) | 22–25 in (56–64 cm) |
| Large end (Bullmastiff-dominant) | 100–130 lb (45–59 kg) | 25–27 in (64–69 cm) |
Most F1 Pit Mastiffs land in the 70–100 lb range as adults, with males skewing toward the upper end. Growth plates in large and giant breeds don't fully close until 18–24 months, so don't expect your dog to reach full physical maturity until around age two. During the adolescent phase (6–18 months), you'll see rapid growth spurts that can make weight tracking feel unpredictable.
Practical tip: Ask the breeder for the exact weights of both parents. A reasonable estimate for an F1 puppy's adult weight is the average of the two parents' weights, plus or minus 15%. If the APBT parent is 55 lb and the Bullmastiff parent is 115 lb, expect puppies in the 72–98 lb range.
Understanding Generations: F1, F2, and Backcrosses
Generation Explainer
- F1 (First Generation): One purebred APBT parent × one purebred Bullmastiff parent. Maximum genetic diversity, but widest variation in traits between littermates.
- F1B (First-Generation Backcross): An F1 Pit Mastiff × one of the parent breeds (usually the Bullmastiff, to push size up). Slightly more predictable traits.
- F2 (Second Generation): Two F1 Pit Mastiffs bred together. Trait variation widens again due to gene recombination — some puppies may look almost entirely like one grandparent breed.
- Multigen (F3+): Multiple generations of Pit Mastiff × Pit Mastiff breeding. Rare in this particular cross. More stabilized traits but requires a dedicated breeding program with health testing across generations.
The vast majority of Pit Mastiffs you'll encounter are F1 crosses, either intentionally bred or the result of accidental breedings. Multigen lines are uncommon because this mix lacks the commercial demand of doodle-type designer breeds.
For prospective owners, an F1 cross from health-tested parents is generally the most transparent option. You know exactly what breeds are in the mix, and both parents should have verifiable health clearances. With F2 or later generations, genetic variability increases, and without a rigorous breeding program, you're less certain what traits a puppy will express.
Temperament: What to Expect (and What Might Surprise You)
The Pit Mastiff's temperament is where the mix gets genuinely interesting — and where responsible ownership matters most. Both parent breeds are strong, determined dogs with powerful jaws, so temperament isn't just a lifestyle question; it's a safety consideration.
Best-Case Temperament Profile
A well-bred, well-socialized Pit Mastiff often combines the APBT's enthusiasm and people-orientation with the Bullmastiff's calm, watchful steadiness. These dogs tend to be:
- Deeply bonded to their family, often velcro-like in their attachment
- Patient and tolerant with children they're raised alongside
- Alert and aware of their surroundings without being hyperactive
- Responsive to training when motivated by food, toys, or praise
- Quiet in the home — Bullmastiffs are notably low-bark dogs, and this trait often carries over
Challenging Temperament Scenarios
Less predictable traits can emerge, especially without early socialization or with poor breeding:
- Dog selectiveness or aggression: Both breeds can show same-sex aggression or general dog intolerance. This is more common in intact dogs and typically emerges between 18–36 months as the dog reaches social maturity.
- Guarding/resource guarding: The Bullmastiff's guarding instinct can manifest as food guarding, toy guarding, or spatial guarding (blocking access to a person or room).
- Prey drive: APBTs were historically used for catching livestock; some Pit Mastiffs show high prey drive toward cats, small dogs, or wildlife.
- Stubbornness under pressure: Bullmastiffs are known for their "I'll think about it" response to commands. Combined with APBT tenacity, a Pit Mastiff that decides not to do something can be extremely difficult to physically manage at 80+ pounds.
Training Approach
This mix responds best to positive reinforcement methods — food rewards, toy rewards, and life rewards (access to things the dog wants, like going outside, in exchange for compliance). Force-free training isn't just more humane; it's more effective for powerful breeds where adversarial training can trigger resistance or defensive behavior. Avoid shock collars, prong collars, and alpha rolls entirely. If you're dealing with behavioral challenges like leash reactivity or resource guarding, work with a certified professional dog trainer (CPDT-KA) or a veterinary behaviorist (DACVB).
Coat, Shedding, and Grooming
Is a pitbull mixed with a bullmastiff hypoallergenic or low-shedding? No. Neither parent breed carries the low-shedding coat genes found in Poodles or Bichons. Both the APBT and the Bullmastiff have short, single coats that shed moderately year-round with seasonal increases.
| Trait | What to Expect |
|---|---|
| Coat Length | Short, smooth — 0.5 to 1 inch |
| Shedding Level | Moderate year-round; heavier in spring/fall |
| Hypoallergenic | No — not suitable for allergy sufferers |
| Color Range | Brindle, fawn, red, black, blue, white, or any combination with patches or masks |
| Undercoat | Minimal — may inherit denser coat from Bullmastiff side for cold tolerance |
| Drooling | Low to moderate — less than a full Bullmastiff, more than an APBT |
Grooming Routine
Despite the short coat, a Pit Mastiff benefits from a consistent grooming schedule:
- Brushing: 2–3 times per week with a rubber curry brush (like a Kong ZoomGroom, ~$8–$12) or a bristle brush. This removes loose hair and distributes skin oils.
- Bathing: Every 4–8 weeks, or as needed. Use a dog-specific shampoo — human shampoo disrupts canine skin pH. Oatmeal-based formulas work well for sensitive skin ($10–$18 per bottle).
- Wrinkle care: If your dog inherits the Bullmastiff's facial wrinkles, clean the folds 2–3 times weekly with a damp cloth or unscented pet wipe to prevent yeast and bacterial infections. Dry thoroughly.
- Nail trims: Every 2–4 weeks. At 80+ lb, overgrown nails can alter gait and contribute to joint stress.
- Ear cleaning: Weekly check and clean with a veterinary ear cleanser ($8–$15) if ears are floppy; APBT-type rose ears may need less frequent attention.
Health Considerations: Hybrid Vigor vs. Reality
Let's address a common misconception head-on: the idea that mixed-breed dogs automatically enjoy "hybrid vigor" — meaning they're healthier than purebreds due to greater genetic diversity. While outcrossing can reduce the risk of certain recessive genetic conditions, a Pit Mastiff is still at risk for any condition that both parent breeds share, plus some that are specific to one side of the family.
A Pit Mastiff is a large to giant-breed dog, and that body size alone carries health implications regardless of breed mix. According to the Merck Veterinary Manual, hip dysplasia prevalence increases significantly in dogs over 50 lb, and both APBTs and Bullmastiffs are predisposed.
| Condition | Inherited From | Prevalence Notes | Screening Method |
|---|---|---|---|
| Hip Dysplasia | Both breeds | Bullmastiffs: ~21% affected (OFA data); APBTs: ~24% | OFA or PennHIP radiographs at 24+ months ($200–$400) |
| Elbow Dysplasia | Primarily Bullmastiff | Bullmastiffs: ~13% affected | OFA elbow radiographs ($150–$300) |
| Dilated Cardiomyopathy (DCM) | Bullmastiff | Bullmastiffs are a predisposed breed | Echocardiogram by veterinary cardiologist ($300–$600) |
| Demodectic Mange | APBT | APBTs have higher susceptibility to Demodex mites | Skin scraping by vet ($50–$100) |
| Gastric Dilatation-Volvulus (Bloat) | Bullmastiff (deep-chested breeds) | Life-threatening emergency; deep-chested dogs at highest risk | Preventive gastropexy discussed with vet ($300–$800 if done during spay/neuter) |
| Cancer (Lymphoma, Mast Cell Tumors) | Bullmastiff | Bullmastiffs have elevated cancer rates, a leading cause of death | Annual wellness exams; lump aspirates ($80–$200) |
| Cerebellar Ataxia | APBT (specific genetic mutation) | Recessive gene in APBTs; DNA test available | Embark or similar DNA panel ($150–$200) |
Lifespan Expectations
The APBT's 12–16 year lifespan and the Bullmastiff's 7–9 year lifespan create a projected range for the Pit Mastiff of approximately 9–12 years. Larger individuals will likely skew toward the shorter end, while smaller, APBT-leaning dogs may live longer. Maintaining a lean body condition score (BCS of 4–5 out of 9) is one of the most impactful things you can do to extend your dog's life — obesity accelerates joint degeneration and increases cancer risk.
Exercise, Space, and Daily Life Requirements
The Pit Mastiff's exercise needs depend on which parent's energy level dominates, but plan for a moderate-to-active routine:
- Daily exercise: 45–75 minutes of structured activity — walks, play sessions, training work. Split into two sessions to reduce bloat risk (avoid vigorous exercise 1 hour before and 2 hours after meals).
- Mental stimulation: Both breeds are intelligent and bore easily. Food puzzles (Kong Classic, ~$15–$25; Outward Hound Nina Ottosson puzzles, $12–$30), scent work, and trick training sessions prevent destructive behavior.
- Space needs: A fenced yard is strongly recommended — not because this mix is an escape artist, but because a 90-lb dog with prey drive or dog reactivity needs controlled outdoor access. A 6-foot fence is appropriate for the athletic APBT genes.
- Apartment living: Possible with a smaller, APBT-leaning individual and a committed exercise routine, but not ideal. Larger Pit Mastiffs in apartments often struggle with adequate space and stair access that stresses developing joints.
- Heat sensitivity: Short-muzzled dogs (especially those inheriting more Bullmastiff brachycephalic features) overheat quickly. Avoid exercise when temperatures exceed 85°F (29°C). Always provide shade and water.
Cost Breakdown: Purchase Price and Ongoing Expenses
The pitbull mixed with a bullmastiff is not a high-volume designer breed like the Goldendoodle or Labradoodle, so pricing and availability vary significantly by region and breeder reputation.
| Expense Category | Estimated Cost |
|---|---|
| Puppy from responsible breeder | $800–$2,500 (health-tested parents, early socialization) |
| Rescue/adoption | $150–$500 (often includes spay/neuter, vaccines, microchip) |
| First-year veterinary care | $600–$1,200 (vaccines, spay/neuter, heartworm, baseline screenings) |
| Annual care (food, vet, preventives) | $1,500–$3,000/year (large-breed food costs $60–$120/month) |
| Pet insurance (large breed) | $50–$100/month depending on coverage, deductible, and age at enrollment |
| Training (group classes or private) | $200–$600 for puppy series; $80–$150/session for private behavior work |
On availability: This mix is more commonly found in rescues and shelters than through dedicated breeders, particularly in regions with high pitbull-type dog populations. Breed-specific rescues (such as Bullmastiff rescue networks or pitbull advocacy organizations) occasionally take in Pit Mastiff mixes. If purchasing from a breeder, insist on seeing OFA health clearances for both parents, a written health guarantee, and a take-back clause. Avoid any breeder who cannot provide documentation or who breeds multiple "designer" combinations without health testing.
Breed-Specific Legislation: Know Your Local Laws
Because the APBT is one of the parent breeds, a Pit Mastiff may be subject to breed-specific legislation (BSL) in your area. Many municipalities and housing authorities restrict or ban dogs that are identified as pitbull-type, and a Pit Mastiff's appearance can trigger these restrictions even if the dog is technically a mixed breed. Some insurance companies also exclude coverage for pitbull-type dogs or charge higher premiums.
Before committing to this mix, check your city/county ordinances, your homeowner's or renter's insurance policy, and your HOA rules (if applicable). Local laws vary widely — some jurisdictions ban by breed name, others by physical characteristics, and some have no restrictions at all.
Who Should (and Shouldn't) Consider This Mix
This Mix Suits You If:
- You have experience with strong, powerful breeds (not a first-time dog owner)
- You can commit to daily structured exercise and ongoing training
- You have a securely fenced yard or access to safe, controlled exercise areas
- You're prepared for a 70–130 lb dog that may lean on you, pull on leash, or body-block
- You understand and accept potential dog selectiveness or same-sex aggression
- You have no BSL restrictions in your area and your insurance covers the breed type
- You want a loyal, protective companion who bonds intensely with family
Look Elsewhere If:
- This is your first dog or you lack experience managing large, strong dogs
- You want an off-leash dog park dog — this mix is often not a good candidate
- You live in housing with BSL restrictions or breed-based insurance exclusions you can't resolve
- You want a low-maintenance dog that can be left alone 10+ hours daily
- You have small pets (cats, rabbits, small dogs) and can't manage a careful introduction period
- You're not prepared for potential emergency vet costs of $3,000–$7,000 (bloat, orthopedic surgery)
Frequently Asked Questions
What two breeds make up a Pit Mastiff?
A Pit Mastiff is a cross between an American Pit Bull Terrier (or sometimes an American Staffordshire Terrier) and a Bullmastiff. The specific pitbull-type breed used can affect size, head shape, and energy level.
How big will a pitbull mixed with a bullmastiff get?
Most Pit Mastiffs weigh between 70–100 lb (32–45 kg) and stand 22–25 inches (56–64 cm) at the shoulder, though individuals can range from 50 lb to 130 lb depending on which parent's genes dominate.
Are Pit Mastiffs good family dogs?
With proper breeding, early socialization, and experienced handling, Pit Mastiffs can be excellent family dogs — loyal, affectionate, and patient with children they know. However, their size and strength mean interactions with young children should always be supervised, and their potential dog selectiveness makes them less suited for multi-dog households without careful management.
Is a pitbull mixed with a bullmastiff hypoallergenic?
No. Both parent breeds have short, shedding coats. A Pit Mastiff will shed moderately year-round and is not suitable for people with dog allergies.
How long do Pit Mastiffs live?
Expect a lifespan of approximately 9–12 years, which is an intermediate range between the APBT's longer lifespan and the Bullmastiff's shorter one. Maintaining a healthy weight and staying current on preventive care can help maximize longevity.
Do Pit Mastiffs drool a lot?
Typically less than a full Bullmastiff but more than an APBT. If your dog inherits looser jowls from the Bullmastiff side, expect moderate drooling, especially after drinking or eating. Keep a towel handy.
Can I find a Pit Mastiff in a rescue?
Yes — this mix is more commonly found in shelters and breed-specific rescues than through dedicated breeders. Check pitbull rescues, Bullmastiff rescue networks, and large-breed rescues in your region. Adoption fees typically range from $150 to $500.
This article is for informational purposes only and does not replace professional veterinary advice. Always consult your veterinarian for health decisions specific to your dog. If you suspect your dog has ingested a toxic substance, contact the ASPCA Animal Poison Control Center at (888) 426-4435 (24/7, consultation fee applies).
Jonas Cole
All our authors care for dogs every day — read more of their work on the authors page.
