Bullmastiff vs Shih Tzu
A side-by-side comparison to help you find the right breed for your lifestyle.
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
Shih Tzu
The Shih Tzu is a small and affectionate dog breed known for its luxurious, flowing coat and friendly, outgoing personality. Originally bred as a companion for Chinese royalty, the Shih Tzu is cherished today as a loving and devoted family pet.
Small
Low
10-16 years yrs
N/A
Quick Comparison
| Trait | Bullmastiff | Shih Tzu |
|---|---|---|
| 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 | Bullmastiff | Shih Tzu |
|---|---|---|
| Size | Extra Large | Small |
| Energy Level | Medium | Low |
| Grooming | Medium | High |
| Trainability | challenging | challenging |
| Barking Level | Low | High |
| Shedding Level | Medium | Low |
| Chew strength | Hard | Light |
| Housing | Yard | Apartment |
Owner Fit & Decision Guide
Owner Match
| Trait | Bullmastiff | Shih Tzu |
|---|---|---|
| Experience Level | Experienced | Experienced |
| First-Time Owner | ||
| Ideal Owner | Active individual or family who can provide adequate exercise and training for a Bullmastiff. | Active individual or family who can provide adequate exercise and training for a Shih Tzu. |
Bullmastiff Dealbreakers
- Cannot meet 60-60 min daily exercise
- Cannot commit to grooming needs
Shih Tzu Dealbreakers
- Cannot meet 20-30 min daily exercise
- Cannot commit to grooming needs
Surrender Risk
| Factor | Bullmastiff | Shih Tzu |
|---|---|---|
| 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 | Bullmastiff | Shih Tzu |
|---|---|---|
| Prey Drive | ||
| Watchdog Ability | ||
| Stranger Friendly | ||
| Drool Level | ||
| Wanderlust |
Vocalization
| Trait | Bullmastiff | Shih Tzu |
|---|---|---|
| Barking Level | Low | High |
| Howling Tendency | ||
| Whining Tendency | Low | Low |
| Separation Vocalization |
Safety & Reliability
| Trait | Bullmastiff | Shih Tzu |
|---|---|---|
| Escape Artist | ||
| Dog Park Suitable | ||
| Off-Leash Reliable | ||
| Small Animal Safe | ||
| Leash Reactivity | ||
| Resource Guarding Risk | Low | Low |
Bullmastiff Social Traits
Moderate
Selective
Shih Tzu Social Traits
Moderate
Generally friendly
Training
Bullmastiff
- ** Positive reinforcement is the only viable path. Harsh corrections often cause this breed to shut down or become defensive.
Shih Tzu
- **: Positive reinforcement only. This breed shuts down or becomes defensive with harsh correction.
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 | Bullmastiff | Shih Tzu |
|---|---|---|
| With Cats | Generally safe with proper introduction | Generally safe with proper introduction |
| Small Mammals | Supervision required | Supervision required |
| Birds / Reptiles | Caution advised | Caution advised |
Advanced Behavior
| Trait | Bullmastiff | Shih Tzu |
|---|---|---|
| Predatory Sequence Risk | Medium | Medium |
| Biddability | Low | Low |
| Noise Sensitivity | Low | Low |
| Territorial Barking | ||
| Same-Sex Aggression Onset | 18 months | 18 months |
First Year & Life Stages
First Year Challenges
| Challenge | Bullmastiff | Shih Tzu |
|---|---|---|
| Puppy Difficulty | ||
| Destructive Phase | 6-18 | 4-10 |
| House Training | Moderate | Moderate |
| Crate Training | Medium | Medium |
| Adolescent Regression |
Bullmastiff: Bullmastiff puppies require consistent training and patience.
Shih Tzu: Shih Tzu puppies require consistent training and patience.
Life Stages Timeline
| Stage | Bullmastiff | Shih Tzu |
|---|---|---|
| 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 | Bullmastiff | Shih Tzu |
|---|---|---|
| Height | N/A | N/A |
| Weight | Not enough data yet | Not enough data yet |
| Size Category | Extra Large | Small |
| Lifespan | 7–9 years | 10–16 years |
| Litter Size | 4-8 | 4-8 |
Bullmastiff Coat
Shih Tzu Coat
Lineage & Origin
| Detail | Bullmastiff | Shih Tzu |
|---|---|---|
| Original Purpose | Developed in mid-19th century England, the Bullmastiff was created by gamekeepers to combat poachers | The Shih Tzu ("Lion Dog") was developed in the palaces of the Chinese Emperor, likely by crossing th |
| Origin | N/A | Tibet) with the Pekingese |
Breeding Details
| Detail | Bullmastiff | Shih Tzu |
|---|---|---|
| C-Section Rate | Varies | Varies |
| Whelping Difficulty | Medium | Medium |
| Puppy Mortality Rate | Low | Low |
Physical Risks
| Risk | Bullmastiff | Shih Tzu |
|---|---|---|
| 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
Bullmastiff Health Issues
Shih Tzu Health Issues
Bullmastiff Suggested Tests
- OFA/PennHIP for hip/elbow dysplasia
- Echocardiogram for cardiac issues
- CERF for eye conditions
- Prophylactic gastropexy
Shih Tzu Suggested Tests
- Renal Dysplasia (wedge biopsy or ultrasound)
- CERF/CAER eye clearances
Health Risk Overview
| Risk Factor | Bullmastiff | Shih Tzu |
|---|---|---|
| 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 | Bullmastiff | Shih Tzu |
|---|---|---|
| Skin Allergies | ||
| Environmental Allergies | ||
| Stomach Sensitivity | Low | Low |
| Food Allergies |
Health Maintenance
| Care Item | Bullmastiff | Shih Tzu |
|---|---|---|
| Nail Growth Rate | Normal | Normal |
| Eye Care Needs | Low | Low |
| Anal Gland Issues | Occasional | Occasional |
Senior Care & Aging
Bullmastiff Senior Care
Common Senior Issues
- Arthritis
- Vision decline
- Cognitive changes
Senior care varies by individual health.
Shih Tzu Senior Care
Common Senior Issues
- Arthritis
- Vision decline
- Cognitive changes
Senior care varies by individual health.
Grooming & Care
Bullmastiff
medium maintenanceShih Tzu
high maintenanceLifestyle Compatibility
Bullmastiff Daily Life
Shih Tzu Daily Life
Housing & Legal Restrictions
| Restriction | Bullmastiff | Shih Tzu |
|---|---|---|
| BSL Restricted | ||
| Common Rental Ban | ||
| Insurance Blacklist | ||
| Weight Category | Under 50lbs | Under 50lbs |
Climate Tolerance
| Climate | Bullmastiff | Shih Tzu |
|---|---|---|
| Heat Tolerance | ||
| Cold Tolerance | ||
| Water Affinity | Medium | Medium |
Travel Compatibility
| Activity | Bullmastiff | Shih Tzu |
|---|---|---|
| Car Travel | Good | Good |
| Camping | ||
| Beach Friendly | ||
| Hiking Rating | ||
| Cabin Flight Eligible | ||
| Hotel Friendly Size |
Niche Suitability
| Role | Bullmastiff | Shih Tzu |
|---|---|---|
| Service Dog | Low | 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 | Bullmastiff | Shih Tzu |
|---|---|---|
| Purchase Price | N/A | N/A |
| Initial Cost Range | $1,000–$2,500 | $1,000–$2,500 |
| Cost Tier |
Ongoing Costs
| Cost | Bullmastiff | Shih Tzu |
|---|---|---|
| Monthly Range | $180–$300 | $70–$120 |
| Yearly Range | $2,160–$3,600 | $840–$1,440 |
| Food / Month | $100-150 | $30-50 |
| Insurance / Month | $80-150 | $40-70 |
| Grooming / Session | N/A | $60-100 |
| Vet Routine / Year | $500-800 | $500-800 |
| Monthly Cost Tier |
Bullmastiff Lifetime Cost
N/A
Shih Tzu Lifetime Cost
N/A
Quirks & Fun Facts
Daily Quirks
| Quirk | Bullmastiff | Shih Tzu |
|---|---|---|
| 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
Turn your dog into a brand deal.
Pet brands are looking for authentic creators — not celebrities. If you own a Bullmastiff or Shih Tzu, you can get free products, gear, and exclusive perks just for sharing your dog's life on Instagram.
No followers minimum · Free to join
Compare with Other Breeds
Compare Bullmastiff with:
Based on comprehensive breed research data.