Mastiff vs Shih Tzu
A side-by-side comparison to help you find the right breed for your lifestyle.
Mastiff
Also known as: English Mastiff, Old English Mastiff
The Mastiff (English Mastiff) is a giant guardian breed of immense dignity, courage, and docility. With ancestors depicted in Assyrian bas-reliefs from 2500 BC, these ancient war dogs and estate guardians have been bred down to gentle family companions. But the reality of living with a dog that can exceed 200lbs is often romanticized - between the short 6-10 year lifespan, potential for bone cancer, and costs that dwarf most breeds, they're called a 'heartbreak breed' for good reason.
Extra Large
Low
6-10 yrs
70-76+ cm
70-104+ kg
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 | Mastiff | 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 | Mastiff | Shih Tzu |
|---|---|---|
| Size | Extra Large | Small |
| Energy Level | Low | Low |
| Grooming | High | High |
| Trainability | challenging | challenging |
| Barking Level | Medium | High |
| Shedding Level | Medium | Low |
| Chew strength | Hard | Light |
| Housing | Yard | Apartment |
Owner Fit & Decision Guide
Owner Match
| Trait | Mastiff | Shih Tzu |
|---|---|---|
| Experience Level | Advanced | Experienced |
| First-Time Owner | ||
| Ideal Owner | Experienced large breed owner with house and yard. Works from home or can be home most of the day. Financially prepared for $3,000+ annual costs and $5,000+ emergency fund. Physically able to manage 200lb dog. Psychologically prepared for 6-10 year lifespan and likely cancer diagnosis. | Active individual or family who can provide adequate exercise and training for a Shih Tzu. |
Mastiff Dealbreakers
- Apartment living (unless ground floor and extremely dedicated)
- Fastidious cleaners (drool/hair is unmanageable)
- Tight budget (one vet bill can bankrupt you)
- Physically frail owners (cannot hold 200lb dog on leash)
- Cannot emotionally handle short lifespan
Shih Tzu Dealbreakers
- Cannot meet 20-30 min daily exercise
- Cannot commit to grooming needs
Surrender Risk
| Factor | Mastiff | Shih Tzu |
|---|---|---|
| Risk Level | Medium | Medium |
| Primary Reasons | 'Moving/Housing Restrictions' - landlords evict due to size/breed, Cost - giant breed vet bills shock unprepared owners, Cute puppy becomes 150lb adolescent they can't afford to feed or vet | Underestimated exercise needs, Behavioral challenges, Cost of care |
Temperament & Personality
Behavior Comparison
| Trait | Mastiff | Shih Tzu |
|---|---|---|
| Prey Drive | ||
| Watchdog Ability | ||
| Stranger Friendly | ||
| Drool Level | ||
| Wanderlust |
Vocalization
| Trait | Mastiff | Shih Tzu |
|---|---|---|
| Barking Level | Medium | High |
| Howling Tendency | ||
| Whining Tendency | Low | Low |
| Separation Vocalization |
Safety & Reliability
| Trait | Mastiff | Shih Tzu |
|---|---|---|
| Escape Artist | ||
| Dog Park Suitable | ||
| Off-Leash Reliable | ||
| Small Animal Safe | ||
| Leash Reactivity | ||
| Resource Guarding Risk | Moderate | Low |
Mastiff Social Traits
High
Same-sex aggression can develop around 18-24 months. Socialization critical to prevent wariness becoming fear-aggression.
Shih Tzu Social Traits
Moderate
Generally friendly
Training
Mastiff
- Ask once, then lure/help them succeed
- Train for partnership, not just obedience
- Start leash manners EARLY before they're physically unmanageable
- Use high-value treats - they are food motivated
Shih Tzu
- **: Positive reinforcement only. This breed shuts down or becomes defensive with harsh correction.
Mastiff Considerations
Average lifespan is only 6-10 years, with 8 being the median. Owners must be psychologically prepared to lose their companion just as they enter their senior years. Bone cancer is the leading cause of death.
Unlike eager-to-please breeds, Mastiffs often ask 'Why?' before complying. When they decide not to cooperate, they simply flatten themselves to the floor - physically unmanageable at 200lbs. Harsh training causes complete shutdown.
Mature Mastiffs can develop intolerance toward dogs of the same sex, typically emerging around 18-24 months. Difficult to manage due to sheer power differential between owner and dog.
$150-300/month for food alone. Insurance $100-200+/month. All medications priced by weight (3-4x cost of Labrador). A single emergency can exceed $5,000. If this would bankrupt you, do not get this breed.
Multi-Species Compatibility
| Species | Mastiff | Shih Tzu |
|---|---|---|
| With Cats | Generally safe if raised together - low prey drive | Generally safe with proper introduction |
| Small Mammals | Generally safe - no terrier-like kill instinct | Supervision required |
| Birds / Reptiles | Generally neutral | Caution advised |
Advanced Behavior
| Trait | Mastiff | Shih Tzu |
|---|---|---|
| Predatory Sequence Risk | Arrested | Medium |
| Biddability | Low | Low |
| Noise Sensitivity | Low | Low |
| Territorial Barking | ||
| Same-Sex Aggression Onset | 18 months | 18 months |
Mastiff: Predatory sequence arrested: Orient -> Eye -> (Stalk/Chase/Grab/Kill inhibited). They may chase out of territorial instinct but lack 'kill bite' of terriers. High adaptive intelligence (problem-solving), low working intelligence (obedience repetition). They work for partnership, not just kibble.
First Year & Life Stages
First Year Challenges
| Challenge | Mastiff | Shih Tzu |
|---|---|---|
| Puppy Difficulty | ||
| Destructive Phase | 6-18 | 4-10 |
| House Training | Medium | Moderate |
| Crate Training | Medium | Medium |
| Adolescent Regression |
Mastiff: Calmer than sporting/herding breeds but 6-month puppy can weigh 80lbs with baby brain. They are clumsy, mouthy, and accidentally knock over children/furniture. Teething Mastiff can chew through solid wood door frames. A rebellious 150lb teenager pulling on leash is a safety hazard.
Shih Tzu: Shih Tzu puppies require consistent training and patience.
Life Stages Timeline
| Stage | Mastiff | Shih Tzu |
|---|---|---|
| Puppy Phase | 18 months | 12 months |
| Adolescence | 18-36 | 6-18 |
| Adult Years | 3-6 | 2-8 |
| Senior Onset | ~6 years | ~8 years |
| Peak Energy Age | 1-2 years | 1-3 years |
Size & Physical Characteristics
Physical Stats
| Measurement | Mastiff | Shih Tzu |
|---|---|---|
| Height | 70-76+ cm | N/A |
| Weight | Not enough data yet | Not enough data yet |
| Size Category | Extra Large | Small |
| Lifespan | 6–10 years | 10–16 years |
| Litter Size | 8-10 | 4-8 |
Mastiff Coat
Shih Tzu Coat
Lineage & Origin
| Detail | Mastiff | Shih Tzu |
|---|---|---|
| Original Purpose | War dogs, guardians, and hunters of large game (lions, bears, wolves). In England, estate guardians protecting from poachers. Job was to seize and hold intruders using sheer mass. | The Shih Tzu ("Lion Dog") was developed in the palaces of the Chinese Emperor, likely by crossing th |
| Origin | Ancient breed - ancestors depicted in Assyrian bas-reliefs from 2500 BC | Tibet) with the Pekingese |
Breeding Details
| Detail | Mastiff | Shih Tzu |
|---|---|---|
| C-Section Rate | High | Varies |
| Whelping Difficulty | High | Medium |
| Puppy Mortality Rate | Moderate | Low |
Physical Risks
| Risk | Mastiff | Shih Tzu |
|---|---|---|
| Bloat / GDV Risk | High | Low |
| Slippery Floor Risk | High | Low |
| Min Fence Height | 1.8m | 1.5m |
| Dig / Escape Risk | Low | Low |
Health & Common Conditions
Mastiff Health Issues
Shih Tzu Health Issues
Mastiff Suggested Tests
- PRA (Progressive Retinal Atrophy)
- Cystinuria DNA test
- DM (Degenerative Myelopathy)
- OFA or PennHIP for hips and elbows
- Cardiac evaluation
Shih Tzu Suggested Tests
- Renal Dysplasia (wedge biopsy or ultrasound)
- CERF/CAER eye clearances
Health Risk Overview
| Risk Factor | Mastiff | Shih Tzu |
|---|---|---|
| Cancer Risk | Very High | Medium |
| Cardiac Risk | Medium | Low |
| Neurological Risk | Low | Low |
| CCL/ACL Tear Risk | High | Low |
| Vet Burden Tier | Very High | Medium |
Sensitivities & Allergies
| Sensitivity | Mastiff | Shih Tzu |
|---|---|---|
| Skin Allergies | ||
| Environmental Allergies | ||
| Stomach Sensitivity | Medium | Low |
| Food Allergies |
Health Maintenance
| Care Item | Mastiff | Shih Tzu |
|---|---|---|
| Nail Growth Rate | Fast | Normal |
| Eye Care Needs | Medium | Low |
| Anal Gland Issues | Occasional | Occasional |
Senior Care & Aging
Mastiff Senior Care
Common Senior Issues
- Bone cancer (osteosarcoma)
- Arthritis (almost guaranteed)
- Heart issues
Rapid decline often starts around 6 years. May need 'Help 'Em Up' harness to assist standing. Euthanasia at home recommended if possible - transporting non-ambulatory 200lb dog to vet clinic is physically impossible for most owners without stretcher and team.
Shih Tzu Senior Care
Common Senior Issues
- Arthritis
- Vision decline
- Cognitive changes
Senior care varies by individual health.
Grooming & Care
Mastiff
high maintenanceShih Tzu
high maintenanceLifestyle Compatibility
Mastiff Daily Life
Shih Tzu Daily Life
Housing & Legal Restrictions
| Restriction | Mastiff | Shih Tzu |
|---|---|---|
| BSL Restricted | ||
| Common Rental Ban | ||
| Insurance Blacklist | ||
| Weight Category | Over 50lbs | Under 50lbs |
Climate Tolerance
| Climate | Mastiff | Shih Tzu |
|---|---|---|
| Heat Tolerance | ||
| Cold Tolerance | ||
| Water Affinity | Low | Medium |
Travel Compatibility
| Activity | Mastiff | Shih Tzu |
|---|---|---|
| Car Travel | Good | Good |
| Camping | ||
| Beach Friendly | ||
| Hiking Rating | ||
| Cabin Flight Eligible | ||
| Hotel Friendly Size |
Niche Suitability
| Role | Mastiff | Shih Tzu |
|---|---|---|
| Service Dog | Low | Low |
| Therapy Dog | Medium | Low |
| Deep Pressure Therapy | ||
| Canicross / Bikejoring | ||
| Apartment Adaptable | ||
| Tactile / Sensory Friendly | ||
| Livestock Guardian | ||
| Medical Alert | Low | Low |
Costs & Expenses
Upfront Costs
| Cost | Mastiff | Shih Tzu |
|---|---|---|
| Purchase Price | $1,500-4,000 | N/A |
| Initial Cost Range | $1,500–$4,000 | $1,000–$2,500 |
| Cost Tier |
Ongoing Costs
| Cost | Mastiff | Shih Tzu |
|---|---|---|
| Monthly Range | $300–$600 | $70–$120 |
| Yearly Range | $3,600–$7,200 | $840–$1,440 |
| Food / Month | $150-300 | $30-50 |
| Insurance / Month | $100-200+ | $40-70 |
| Grooming / Session | $75-125 | $60-100 |
| Vet Routine / Year | $450-600 | $500-800 |
| Monthly Cost Tier |
Mastiff Lifetime Cost
$25,000-60,000
Shih Tzu Lifetime Cost
N/A
Quirks & Fun Facts
Daily Quirks
| Quirk | Mastiff | Shih Tzu |
|---|---|---|
| Snoring | ||
| Flatulence | Frequent | Occasional |
| Slobber Level | Heavy | Low |
| Smell When Wet | Strong | Moderate |
| Zoomies Frequency | Rare | Occasional |
| Counter Surfing | ||
| Digging Tendency | Low | Low |
Mastiff Quirks
The Mastiff Lean
Will lean their full weight (up to 200lbs) against your legs. Fall risk for children and elderly.
Ceiling Slobber
Not just when eating - they shake heads and 'fling' slime. It will be on clothes, walls, and TV.
Passive Resistance
When they don't want to do something, they simply flatten to the floor. Physically impossible to move a 200lb dog that doesn't want to move.
Room-Clearing Gas
Flatulence is frequent and potent, often clearing a room.
Frequently Asked Questions
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Compare with Other Breeds
Based on comprehensive breed research data.