Mastiff Puppies: Adopt or Buy in Australia?

Should you adopt or buy a Mastiff?

It depends on whether it has to be a purebred puppy. Purebred Mastiffs are rare across the rescues we aggregate, so if you want a Mastiff puppy from hip and elbow scored parents, a registered breeder is the realistic route, and you may wait. If what you want is a big, calm, gentle house dog, adult mastiffs and mastiff crosses do come through rescues and pounds, and an adult comes with a known size, drool level and temperament.

The RSPCA Australia Knowledgebase suggests the RSPCA or a reputable rescue first, and if you go to a breeder, making sure they are registered, visiting where the puppies were born and meeting the parents. Our guide to adopting a dog in Australia covers the rescue process step by step.

Reference only, not quotes. Figures read on 11 November 2026; breeders and rescues set their own prices and change them, so check with them.

How much is a Mastiff puppy from a registered breeder?

There is no published figure to quote. Most Mastiff kennels we found have a listing-site page only, and we could find just 4 Australian Mastiff breeders with their own websites. We read all 4 in November 2026, and none published a puppy price; they show past litters, their dogs and contact details. We also could not find an active Australian Mastiff club website, so there is no club guide price either.

Prices on listing sites and classified ads are left out, because we cannot check who is selling. So the honest answer is: ask each breeder, and compare what the price includes, such as vaccinations, microchip, a vet check, Limited or Main Register papers and puppy insurance.

Reference only, not quotes. Fees change, so check with the rescue. RSPCA NSW says its fees ensure pets are desexed, microchipped, vaccinated and health-checked.

How is a Mastiff different from a Bullmastiff, Cane Corso or Dogue de Bordeaux?

On paper, clearly. Each is a separate breed with its own Dogs Australia standard, and all four sit in Group 6 (Utility). The table uses only what each standard says.

Sources: Dogs Australia breed standards for each breed, read 11 November 2026.

Dogs Australia's Mastiff profile adds the history: Mastiffs were later bred with Regency Bulldogs to produce the Bullmastiff, and a Mastiff's body should be longer than a Bullmastiff's, with a black mask in every colour. In rescue, “mastiff” is often a description of a big, heavy-headed dog rather than a pedigree, so read the listing and meet the dog. If you are weighing up the Italian breed, our Cane Corso guide covers it in full, and our Bullmastiff guide covers the gamekeeper's dog.

Which health tests should a Mastiff breeder show you?

Hips and elbows for both parents, at the least. Dogs Australia's Mastiff profile says most breeders have their breeding animals scored for hip and elbow dysplasia, some have eye and heart checks as well, and recommends only buying from breeders that at least have the hips and elbows done. Dogs Victoria says the breed's health problems may include bone disorders and eye problems.

Sources: Dogs Australia, Dogs Victoria and the Royal Kennel Club (UK), read 11 November 2026. This is a buying checklist, not veterinary advice. Our Mastiff health guide covers what these conditions mean once you own one.

Bloat is the emergency to know. Cornell University's College of Veterinary Medicine says gastric dilatation-volvulus (GDV) is a life-threatening condition that occurs suddenly and that large, deep-chested dogs are most at risk. If your dog retches with nothing coming up, has a swollen belly or is restless and drooling more than usual, call or go to your nearest vet now. Our dog bloat (GDV) guide covers the signs and what to ask your vet about prevention.

How long do Mastiffs live?

Often under 10 years. Dogs Victoria gives an average life span of 8 to 10 years, and the Royal Kennel Club lists under 10 years. In a study of 584,734 UK dogs from breed registries, veterinary groups, insurers, welfare charities and universities (McMillan and colleagues, 2024), the Mastiff's median lifespan was 9.0 years, among the shortest of the breeds studied. That is a UK population, but it sits within Dogs Victoria's range.

For an adopter, that cuts both ways. A puppy gives you the most years. An adult from rescue gives you fewer, but with the size, nature and health already known. Our senior dog adoption guide covers what to expect from an older dog.

How much exercise does a Mastiff need, and how fast does it grow?

Moderate exercise as an adult; patience as a puppy. The Royal Kennel Club in the UK rates the Mastiff at up to 1 hour of exercise a day and lists it as suited to a large house and a large garden. Mastiffs grow for a long time: in a study of 12 breeds (Hawthorne and colleagues, Journal of Nutrition, 2004), the four English Mastiff puppies took about 23 weeks to reach half their adult weight, the longest of the breeds studied, and the large and giant breeds took about 11 to 15 months to reach 99 per cent of adult weight.

Dogs Australia's profile says the Mastiff grows at an exceptionally fast rate, so it is important to keep portion sizes up in the early years, and that an adult does not eat as much as you might expect for its size. Ask your breeder and vet how much walking and feeding suit a growing puppy, and avoid long runs and jumping out of cars while the joints are growing. The dog exercise calculator shows the Kennel Club breed ratings side by side, with RSPCA advice for puppies and hot days.

Can a Mastiff cope with an Australian summer?

Yes, with planning. The RSPCA Knowledgebase on heatstroke says to exercise dogs at the coolest times of day, to give a cool, shaded, well-ventilated area and water at all times, to avoid hot surfaces, to keep dogs lean because overweight dogs overheat faster, and never to leave a dog in a car. A heavy giant dog in a hot backyard needs real shade and airflow, not just a kennel. Our dogs in hot weather guide has the full first aid and state hot-car rules.

What does a Mastiff cost to keep?

More than an average dog. The Animal Medicines Australia Pets in Australia 2025 release estimated that dog-owning households spent $2,520 a year on average, for dogs of every size. Dogs Australia's Mastiff profile names vet costs as one downside of the breed, because medicines dispensed by size can be expensive, and says flea and heartworm prevention also adds up. That national figure is a survey average, not a quote, and a Mastiff's bills may well sit above it.

The dog cost calculator estimates the first year for a giant dog, and our giant-breed ownership guide covers space, drool and day-to-day life.

Is a Mastiff restricted anywhere in Australia?

No state or territory list names the Mastiff. The restricted or prohibited breeds named in state law are the American Pit Bull Terrier, Japanese Tosa, Dogo Argentino, Fila Brasileiro and Perro de Presa Canario, and the ACT has no restricted breeds. The Tasmanian Government goes further and names the Mastiff and Bullmastiff among breeds that “are not restricted but can look similar to and be mistaken for restricted breed dogs”.

Councils can still assess an individual dog's behaviour and declare a dog dangerous or menacing, whatever its breed. With a dog this big, early training and socialisation matter for that reason too. Our Staffy vs pit bull guide has the state-by-state law in full, and best guard dogs in Australia covers the guardian breeds honestly.

What do Mastiffs in rescue look like?

Mostly adults and crosses. Across the rescues, shelters and council pounds we aggregate, a purebred Mastiff is listed only now and then, while big mastiff-type crosses are more common. We could not find a Mastiff-only rescue in Australia that is currently operating, so the general rescues and pounds are where these dogs turn up. An alert on the Mastiff breed page matters more than checking once.

An adult from a rescue or foster home has finished growing, so you can see its full size, how it is with strangers and how much it drools, along with notes on children, other dogs and time alone. For a first-time giant-dog owner, that is worth a lot.

How do Mastiff puppy scams work?

Scamwatch says scammers set up fake websites and fake social media and marketplace profiles to sell popular breeds and pets that do not exist, that a very cheap pet is likely a scam, and that being told to pay by unusual methods, such as money order, gift cards or cryptocurrency, is a warning sign.

• No breeder number. The Queensland Government says not to buy a puppy from a person who does not have a valid breeder identification number (BIN). NSW, Victoria, South Australia and the ACT also require an identifying number in puppy ads. Look it up on the official register, not through a link the seller sends.
• A membership number you cannot check. Ask for the breeder's Dogs Australia membership number and check it with the state body yourself.
• No hip and elbow scores. Dogs Australia's profile recommends only buying from breeders that at least have the hips and elbows done.
• The wrong breed. “Mastiff” in an ad can mean anything big. Ask which breed is on the pedigree, and compare the parents with the standards above.
• Payment before viewing. Scamwatch advises inspecting in person before you pay. A seller who wants a deposit, will only send the puppy and never lets you visit does not let you do that.

Our guide to puppies for sale in Australia has the full state-by-state table of breeder numbers and what to do if you have already paid.

When is a registered breeder the better choice?

Rescue is not right for everyone. A registered breeder makes sense if you want a purebred Mastiff puppy from scored parents, if you want to show, or if you have watched the rescue listings for months and no adult has suited your home.

1. Registration. Check the membership number with Dogs Australia or your state body, and your state's breeder number on the official register.
2. Health results for both parents: hips and elbows at the least, and ask about eyes and heart.
3. The mother, in person, and where the puppies are raised. In some cases the sire may be there too, Dogs Australia's profile says.
4. Answers to your questions. The profile says a good breeder will answer all your questions.
5. A written contract covering health, papers and whether the breeder will take the dog back if you cannot keep it.

Is a Mastiff the right dog for you?

The Dogs Australia standard asks for a “Large, powerful, well-knit frame. A combination of grandeur and courage”, with a temperament that is “Calm, affectionate to owners, but capable of guarding. Usually indifferent with strangers; timidity is unacceptable.” Be honest about five things.

Not sure a giant breed fits? The what dog breed is right for me quiz and the adoption readiness check each take a few minutes, and big dog breeds compares the Mastiff with other large and giant dogs.

Find a Mastiff near you

Mastiffs and mastiff crosses listed by rescues, by city:

• Mastiffs for adoption in Sydney
• Mastiffs for adoption in Melbourne
• Mastiffs for adoption in Brisbane
• Mastiffs for adoption in Perth
• Mastiffs for adoption in Adelaide

Local guides to adopting a Mastiff, with the rescues that serve each city: Sydney, Melbourne, Brisbane, Gold Coast, Sunshine Coast, Perth, Adelaide, Auckland.

Weighing up other giant breeds? Our Bullmastiff, Cane Corso, Great Dane, Newfoundland, Saint Bernard and Irish Wolfhound guides cover the same questions, and the Belgian Malinois guide covers a very different working dog. The large dogs in Sydney and in Melbourne are worth a look too.