Mastiff vs Portuguese Water Dog
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
Portuguese Water Dog
Also known as: PWD, Portie, Cão de Água Português, Obama Dog
The Portuguese Water Dog (PWD) is a highly energetic and intelligent breed known for its curly, hypoallergenic coat and exceptional swimming abilities. Originally bred to work alongside Portuguese fishermen—herding fish into nets, retrieving lost tackle, and swimming messages between boats—they are devoted 'Velcro dogs' who bond intensely with their families.
Medium
High
11-14 yrs
43-57 cm
16-27 kg
Quick Comparison
| Trait | Mastiff | Portuguese Water Dog |
|---|---|---|
| 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 | Portuguese Water Dog |
|---|---|---|
| Size | Extra Large | Medium |
| Energy Level | Low | High |
| Grooming | High | High |
| Trainability | challenging | Easy |
| Barking Level | Medium | Medium |
| Shedding Level | Medium | Low |
| Chew strength | Hard | Moderate |
| Housing | Yard | Yard |
Owner Fit & Decision Guide
Owner Match
| Trait | Mastiff | Portuguese Water Dog |
|---|---|---|
| Experience Level | Advanced | Intermediate |
| 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 willing to hire professional groomer. Works from home or can provide midday activity. Has access to swimming opportunities. Tolerant of a shadow dog that demands interaction. |
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
Portuguese Water Dog Dealbreakers
- Sedentary lifestyle - if you hate walking/swimming, this dog becomes neurotic and destructive
- Budget constraints - if $100/month for grooming is a hardship
- Long work hours - if everyone is gone 9-5 without dog walker or daycare
Surrender Risk
| Factor | Mastiff | Portuguese Water Dog |
|---|---|---|
| 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 | Grooming & Energy - owners underestimate coat maintenance leading to severe matting, Mouthiness in puppyhood surprises and overwhelms owners, Sheer amount of interaction the dog demands |
Temperament & Personality
Behavior Comparison
| Trait | Mastiff | Portuguese Water Dog |
|---|---|---|
| Prey Drive | ||
| Watchdog Ability | ||
| Stranger Friendly | ||
| Drool Level | ||
| Wanderlust |
Vocalization
| Trait | Mastiff | Portuguese Water Dog |
|---|---|---|
| Barking Level | Medium | Medium |
| Howling Tendency | ||
| Whining Tendency | Low | High |
| Separation Vocalization |
Safety & Reliability
| Trait | Mastiff | Portuguese Water Dog |
|---|---|---|
| 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.
Portuguese Water Dog Social Traits
Medium
Generally friendly with proper socialization
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
Portuguese Water Dog
- Use high-value treats and toys - 'Because it pays well' works better than 'Because I said so'
- Keep sessions varied and engaging - they get bored with repetition
- Channel mouthiness into retrieving games and teaching them to carry objects
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.
Portuguese Water Dog Considerations
PWDs were bred to work on small fishing boats alongside their masters all day. They follow you into the bathroom and may develop severe separation anxiety if left alone 8+ hours. Prone to demand barking and whining if ignored.
As a retriever breed, they interact with the world through their mouths. PWD puppies are notoriously 'nippy' and oral—this is not aggression but can be painful and frightening for young children.
This breed is famous for dancing on hind legs and jumping up to greet faces. While charming to some, it's a significant fall risk for elderly owners or small children.
Professional grooming every 6-8 weeks at $100-150 is mandatory, not optional. Neglecting this leads to severe matting that damages skin and requires shave-down.
Multi-Species Compatibility
| Species | Mastiff | Portuguese Water Dog |
|---|---|---|
| With Cats | Generally safe if raised together - low prey drive | Generally safe if socialized - may chase running animals but usually stop when animal stops |
| Small Mammals | Generally safe - no terrier-like kill instinct | Caution - may try to chase and retrieve |
| Birds / Reptiles | Generally neutral | Not a livestock guardian - may try to herd or play with stock |
Advanced Behavior
| Trait | Mastiff | Portuguese Water Dog |
|---|---|---|
| Predatory Sequence Risk | Arrested | Arrested |
| Biddability | Low | High |
| Noise Sensitivity | Low | Low |
| Territorial Barking | ||
| Same-Sex Aggression Onset | 18 months | N/A |
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.
Portuguese Water Dog: Predatory sequence: Orient -> Eye -> Stalk -> Chase -> Grab-Bite. The Kill-Bite and Dissect phases are inhibited. This makes them generally safe with other dogs and often cats, though they may annoy them.
First Year & Life Stages
First Year Challenges
| Challenge | Mastiff | Portuguese Water Dog |
|---|---|---|
| Puppy Difficulty | ||
| Destructive Phase | 6-18 | 6-18 |
| House Training | Medium | Moderate |
| Crate Training | Medium | High |
| 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.
Portuguese Water Dog: PWD puppies are 'land sharks' - their retrieving instinct manifests as severe nipping and mouthing. Combined with high intelligence and energy, they require more management than a Golden Retriever (6/10) but less than a Malinois (9/10).
Life Stages Timeline
| Stage | Mastiff | Portuguese Water Dog |
|---|---|---|
| Puppy Phase | 18 months | 12 months |
| Adolescence | 18-36 | 12-36 |
| Adult Years | 3-6 | 3-9 |
| Senior Onset | ~6 years | ~9 years |
| Peak Energy Age | 1-2 years | 1-3 years |
Size & Physical Characteristics
Physical Stats
| Measurement | Mastiff | Portuguese Water Dog |
|---|---|---|
| Height | 70-76+ cm | 43-57 cm |
| Weight | Not enough data yet | Not enough data yet |
| Size Category | Extra Large | Medium |
| Lifespan | 6–10 years | 11–14 years |
| Litter Size | 8-10 | 4-8 |
Mastiff Coat
Portuguese Water Dog Coat
Lineage & Origin
| Detail | Mastiff | Portuguese Water Dog |
|---|---|---|
| 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. | Fishing crew member - herding fish into nets, swimming messages between boats, retrieving broken nets and tackle |
| Origin | Ancient breed - ancestors depicted in Assyrian bas-reliefs from 2500 BC | Portugal, coastal regions, centuries-old heritage |
Breeding Details
| Detail | Mastiff | Portuguese Water Dog |
|---|---|---|
| C-Section Rate | High | Low |
| Whelping Difficulty | High | Easy |
| Puppy Mortality Rate | Moderate | Low |
Physical Risks
| Risk | Mastiff | Portuguese Water Dog |
|---|---|---|
| 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
Portuguese Water Dog Health Issues
Mastiff Suggested Tests
- PRA (Progressive Retinal Atrophy)
- Cystinuria DNA test
- DM (Degenerative Myelopathy)
- OFA or PennHIP for hips and elbows
- Cardiac evaluation
Portuguese Water Dog Suggested Tests
- prcd-PRA DNA test
- EOPRA DNA test
- JDCM DNA test
- GM-1 DNA test
- OFA Hip Evaluations (or PennHIP)
- Annual Eye Exams (CAER)
Health Risk Overview
| Risk Factor | Mastiff | Portuguese Water Dog |
|---|---|---|
| Cancer Risk | Very High | Low |
| Cardiac Risk | Medium | Medium |
| Neurological Risk | Low | Low |
| CCL/ACL Tear Risk | High | Low |
| Vet Burden Tier | Very High | Medium |
Sensitivities & Allergies
| Sensitivity | Mastiff | Portuguese Water Dog |
|---|---|---|
| Skin Allergies | ||
| Environmental Allergies | ||
| Stomach Sensitivity | Medium | Moderate |
| Food Allergies |
Health Maintenance
| Care Item | Mastiff | Portuguese Water Dog |
|---|---|---|
| Nail Growth Rate | Fast | Normal |
| Eye Care Needs | Medium | Medium |
| Anal Gland Issues | Occasional | Rare |
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.
Portuguese Water Dog Senior Care
Common Senior Issues
- Arthritis/joint stiffness
- Cataracts/PRA progression
- Addison's Disease (can appear at any age)
- Hip dysplasia complications
Slow down significantly around 9+. Watch for clouding eyes (cataracts/PRA) and stiffness (arthritis).
Grooming & Care
Mastiff
high maintenancePortuguese Water Dog
high maintenanceLifestyle Compatibility
Mastiff Daily Life
Portuguese Water Dog Daily Life
Housing & Legal Restrictions
| Restriction | Mastiff | Portuguese Water Dog |
|---|---|---|
| BSL Restricted | ||
| Common Rental Ban | ||
| Insurance Blacklist | ||
| Weight Category | Over 50lbs | 25-50lbs |
Climate Tolerance
| Climate | Mastiff | Portuguese Water Dog |
|---|---|---|
| Heat Tolerance | ||
| Cold Tolerance | ||
| Water Affinity | Low | Extreme |
Travel Compatibility
| Activity | Mastiff | Portuguese Water Dog |
|---|---|---|
| Car Travel | Good | Excellent |
| Camping | ||
| Beach Friendly | ||
| Hiking Rating | ||
| Cabin Flight Eligible | ||
| Hotel Friendly Size |
Niche Suitability
| Role | Mastiff | Portuguese Water Dog |
|---|---|---|
| Service Dog | Low | Medium |
| Therapy Dog | Medium | High |
| Deep Pressure Therapy | ||
| Canicross / Bikejoring | ||
| Apartment Adaptable | ||
| Tactile / Sensory Friendly | ||
| Livestock Guardian | ||
| Medical Alert | Low | Medium |
Costs & Expenses
Upfront Costs
| Cost | Mastiff | Portuguese Water Dog |
|---|---|---|
| Purchase Price | $1,500-4,000 | $2,500-4,500 |
| Initial Cost Range | $1,500–$4,000 | $2,500–$4,500 |
| Cost Tier |
Ongoing Costs
| Cost | Mastiff | Portuguese Water Dog |
|---|---|---|
| Monthly Range | $300–$600 | $150–$300 |
| Yearly Range | $3,600–$7,200 | $2,500–$3,500 |
| Food / Month | $150-300 | $60-90 |
| Insurance / Month | $100-200+ | $50-80 |
| Grooming / Session | $75-125 | $100-150 |
| Vet Routine / Year | $450-600 | $400-1,000 |
| Monthly Cost Tier |
Mastiff Lifetime Cost
$25,000-60,000
Portuguese Water Dog Lifetime Cost
$30,000-50,000
Quirks & Fun Facts
Daily Quirks
| Quirk | Mastiff | Portuguese Water Dog |
|---|---|---|
| Snoring | ||
| Flatulence | Frequent | Rare |
| Slobber Level | Heavy | None |
| Smell When Wet | Strong | None |
| Zoomies Frequency | Rare | Daily |
| 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.
Portuguese Water Dog Quirks
Counter Surfing Ninjas
Their intelligence and food motivation make them expert kitchen thieves - they can steal food with impressive stealth
The Portie Greeting
Famous for dancing on hind legs and jumping up to greet faces - can be a fall risk for elderly or children
The Talker
They 'talk' with grumbles, moans, and varied barks as common ways to communicate their needs
Water Obsession
Most will dive into any body of water including mud puddles and swimming pools
Frequently Asked Questions
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