Australian Shepherd vs Bullmastiff
A side-by-side comparison to help you find the right breed for your lifestyle.
Australian Shepherd
The Australian Shepherd is a highly intelligent and energetic herding breed known for its striking multicolored coat and distinctive eyes. Originally developed in the United States, this versatile and agile dog excels in various canine sports and makes a devoted companion for active families.
Large
High
12-15 years yrs
N/A
Bullmastiff
The Bullmastiff is a large, powerful, and loyal breed known for its protective nature and gentle temperament. Originally bred in England as a gamekeeper's companion to guard estates, this breed combines the strength of a Mastiff with the agility of a Bulldog.
Extra Large
Medium
7-9 years yrs
N/A
Quick Comparison
| Trait | Australian Shepherd | Bullmastiff |
|---|---|---|
| Energy | ||
| Trainability | ||
| Grooming Needs | ||
| Family Friendly | ||
| Independence |
Key Characteristics
| Good with Kids | ||
| Good with Dogs | ||
| Good with Cats | ||
| Hypoallergenic | ||
| Apartment Friendly | ||
| First-Time Owner OK |
| Detail | Australian Shepherd | Bullmastiff |
|---|---|---|
| Size | Large | Extra Large |
| Energy Level | High | Medium |
| Grooming | Medium | Medium |
| Trainability | Easy | challenging |
| Barking Level | High | Low |
| Shedding Level | High | Medium |
| Chew strength | Moderate | Hard |
| Housing | Yard | Yard |
Owner Fit & Decision Guide
Owner Match
| Trait | Australian Shepherd | Bullmastiff |
|---|---|---|
| Experience Level | Beginner | Experienced |
| First-Time Owner | ||
| Ideal Owner | Active individual or family who can provide adequate exercise and training for a Australian Shepherd. | Active individual or family who can provide adequate exercise and training for a Bullmastiff. |
Australian Shepherd Dealbreakers
- Cannot meet 90-120 min daily exercise
- Cannot tolerate heavy shedding
Bullmastiff Dealbreakers
- Cannot meet 60-60 min daily exercise
- Cannot commit to grooming needs
Surrender Risk
| Factor | Australian Shepherd | Bullmastiff |
|---|---|---|
| Risk Level | Medium | Medium |
| Primary Reasons | Underestimated exercise needs, Behavioral challenges, Cost of care | Underestimated exercise needs, Behavioral challenges, Cost of care |
Temperament & Personality
Behavior Comparison
| Trait | Australian Shepherd | Bullmastiff |
|---|---|---|
| Prey Drive | ||
| Watchdog Ability | ||
| Stranger Friendly | ||
| Drool Level | ||
| Wanderlust |
Vocalization
| Trait | Australian Shepherd | Bullmastiff |
|---|---|---|
| Barking Level | High | Low |
| Howling Tendency | ||
| Whining Tendency | Low | Low |
| Separation Vocalization |
Safety & Reliability
| Trait | Australian Shepherd | Bullmastiff |
|---|---|---|
| Escape Artist | ||
| Dog Park Suitable | ||
| Off-Leash Reliable | ||
| Small Animal Safe | ||
| Leash Reactivity | ||
| Resource Guarding Risk | Low | Low |
Australian Shepherd Social Traits
Low
Selective
Bullmastiff Social Traits
Moderate
Selective
Training
Australian Shepherd
- ** They thrive on positive reinforcement (clicker training). Harsh methods often backfire, causing the dog to shut down or become defensive.
Bullmastiff
- ** Positive reinforcement is the only viable path. Harsh corrections often cause this breed to shut down or become defensive.
Australian Shepherd Considerations
Aussies control movement by nipping at heels. In a family setting, they often attempt to "herd" running children, bicycles, or cars. This is not aggression, but a hardwired instinct that can be terrifying for toddlers and a liability for owners.
This breed has an intense need to be with their people. They do not tolerate isolation well. Leaving an Aussie alone for 8+ hours a day frequently leads to severe separation anxiety and destructive chewing.
Unlike the "love everyone" Golden Retriever, the Aussie is naturally reserved with strangers and protective of their territory. Without extensive socialization, this reserve can escalate into fear-based reactivity or aggression toward guests and strangers.
Bullmastiff Considerations
This is a genetically rooted trait in many Bullmastiffs. While they may coexist peacefully with dogs of the opposite sex, placing two males or two females together often results in severe conflict once they reach social maturity (18–24 months). This aggression is rarely "cured" through training; it is managed.
Bred to track and hold poachers silently without human direction, the Bullmastiff is an independent problem solver. They do not have the "will to please" of a Golden Retriever. If a command does not make sense to them, they will simply ignore it. This is often misinterpreted as stupidity; it is actually a refusal to perform rote tasks without high-value motivation.
While independent in thought, they are physically clingy. They will lean their 120-pound bodies against you, sit on your feet, and follow you from room to room. This constant physical presence can be overwhelming for owners who value personal space.
Multi-Species Compatibility
| Species | Australian Shepherd | Bullmastiff |
|---|---|---|
| With Cats | Caution - may chase | Generally safe with proper introduction |
| Small Mammals | Supervision required | Supervision required |
| Birds / Reptiles | Caution advised | Caution advised |
Advanced Behavior
| Trait | Australian Shepherd | Bullmastiff |
|---|---|---|
| Predatory Sequence Risk | Medium | Medium |
| Biddability | High | Low |
| Noise Sensitivity | Low | Low |
| Territorial Barking | ||
| Same-Sex Aggression Onset | 18 months | 18 months |
First Year & Life Stages
First Year Challenges
| Challenge | Australian Shepherd | Bullmastiff |
|---|---|---|
| Puppy Difficulty | ||
| Destructive Phase | 6-18 | 6-18 |
| House Training | Moderate | Moderate |
| Crate Training | Medium | Medium |
| Adolescent Regression |
Australian Shepherd: Australian Shepherd puppies require consistent training and patience.
Bullmastiff: Bullmastiff puppies require consistent training and patience.
Life Stages Timeline
| Stage | Australian Shepherd | Bullmastiff |
|---|---|---|
| Puppy Phase | 12 months | 12 months |
| Adolescence | 6-18 | 6-18 |
| Adult Years | 2-8 | 2-8 |
| Senior Onset | ~8 years | ~8 years |
| Peak Energy Age | 1-3 years | 1-3 years |
Size & Physical Characteristics
Physical Stats
| Measurement | Australian Shepherd | Bullmastiff |
|---|---|---|
| Height | N/A | N/A |
| Weight | Not enough data yet | Not enough data yet |
| Size Category | Large | Extra Large |
| Lifespan | 12–15 years | 7–9 years |
| Litter Size | 4-8 | 4-8 |
Australian Shepherd Coat
Bullmastiff Coat
Lineage & Origin
| Detail | Australian Shepherd | Bullmastiff |
|---|---|---|
| Original Purpose | conformation and coat | Developed in mid-19th century England, the Bullmastiff was created by gamekeepers to combat poachers |
| Origin | Australia—hence the misnomer [cite: 18 | N/A |
Breeding Details
| Detail | Australian Shepherd | Bullmastiff |
|---|---|---|
| C-Section Rate | Varies | Varies |
| Whelping Difficulty | Medium | Medium |
| Puppy Mortality Rate | Low | Low |
Physical Risks
| Risk | Australian Shepherd | Bullmastiff |
|---|---|---|
| Bloat / GDV Risk | Low | Low |
| Slippery Floor Risk | Low | Low |
| Min Fence Height | 1.5m | 1.5m |
| Dig / Escape Risk | Low | Low |
Health & Common Conditions
Australian Shepherd Health Issues
Bullmastiff Health Issues
Australian Shepherd Suggested Tests
- MDR1 Testing
- Annual Eye Exams by veterinary ophthalmologist
Bullmastiff Suggested Tests
- OFA/PennHIP for hip/elbow dysplasia
- Echocardiogram for cardiac issues
- CERF for eye conditions
- Prophylactic gastropexy
Health Risk Overview
| Risk Factor | Australian Shepherd | Bullmastiff |
|---|---|---|
| Cancer Risk | Medium | Medium |
| Cardiac Risk | Low | Low |
| Neurological Risk | Low | Low |
| CCL/ACL Tear Risk | Low | Low |
| Vet Burden Tier | Medium | Medium |
Sensitivities & Allergies
| Sensitivity | Australian Shepherd | Bullmastiff |
|---|---|---|
| Skin Allergies | ||
| Environmental Allergies | ||
| Stomach Sensitivity | Low | Low |
| Food Allergies |
Health Maintenance
| Care Item | Australian Shepherd | Bullmastiff |
|---|---|---|
| Nail Growth Rate | Normal | Normal |
| Eye Care Needs | Low | Low |
| Anal Gland Issues | Occasional | Occasional |
Senior Care & Aging
Australian Shepherd Senior Care
Common Senior Issues
- Arthritis
- Vision decline
- Cognitive changes
Senior care varies by individual health.
Bullmastiff Senior Care
Common Senior Issues
- Arthritis
- Vision decline
- Cognitive changes
Senior care varies by individual health.
Grooming & Care
Australian Shepherd
medium maintenanceBullmastiff
medium maintenanceLifestyle Compatibility
Australian Shepherd Daily Life
Bullmastiff Daily Life
Housing & Legal Restrictions
| Restriction | Australian Shepherd | Bullmastiff |
|---|---|---|
| BSL Restricted | ||
| Common Rental Ban | ||
| Insurance Blacklist | ||
| Weight Category | Under 50lbs | Under 50lbs |
Climate Tolerance
| Climate | Australian Shepherd | Bullmastiff |
|---|---|---|
| Heat Tolerance | ||
| Cold Tolerance | ||
| Water Affinity | Medium | Medium |
Travel Compatibility
| Activity | Australian Shepherd | Bullmastiff |
|---|---|---|
| Car Travel | Good | Good |
| Camping | ||
| Beach Friendly | ||
| Hiking Rating | ||
| Cabin Flight Eligible | ||
| Hotel Friendly Size |
Niche Suitability
| Role | Australian Shepherd | Bullmastiff |
|---|---|---|
| Service Dog | High | Low |
| Therapy Dog | Low | Low |
| Deep Pressure Therapy | ||
| Canicross / Bikejoring | ||
| Apartment Adaptable | ||
| Tactile / Sensory Friendly | ||
| Livestock Guardian | ||
| Medical Alert | Low | Low |
Costs & Expenses
Upfront Costs
| Cost | Australian Shepherd | Bullmastiff |
|---|---|---|
| Purchase Price | N/A | N/A |
| Initial Cost Range | $1,000–$2,500 | $1,000–$2,500 |
| Cost Tier |
Ongoing Costs
| Cost | Australian Shepherd | Bullmastiff |
|---|---|---|
| Monthly Range | $80–$175 | $180–$300 |
| Yearly Range | $960–$2,100 | $2,160–$3,600 |
| Food / Month | $50-100 | $100-150 |
| Insurance / Month | $30-75 | $80-150 |
| Grooming / Session | N/A | N/A |
| Vet Routine / Year | $300-500 | $500-800 |
| Monthly Cost Tier |
Australian Shepherd Lifetime Cost
N/A
Bullmastiff Lifetime Cost
N/A
Quirks & Fun Facts
Daily Quirks
| Quirk | Australian Shepherd | Bullmastiff |
|---|---|---|
| Snoring | ||
| Flatulence | Occasional | Occasional |
| Slobber Level | Low | Low |
| Smell When Wet | Moderate | Moderate |
| Zoomies Frequency | Occasional | Occasional |
| Counter Surfing | ||
| Digging Tendency | Low | Low |
Frequently Asked Questions
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