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How Long Do Mastiffs Live? Average Lifespan, Data & Care Guide

Written by: Kit Copson

Last Updated on July 2, 2024 by Dogster Team

Brindle mastiff sits in a field of green and purple flowers

How Long Do Mastiffs Live? Average Lifespan, Data & Care Guide


Dr. Lauren Demos  Photo


Dr. Lauren Demos

DVM (Veterinarian)

The information is current and up-to-date in accordance with the latest veterinarian research.

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The noble Mastiff is a dog with a big history, a big body, and a big heart—and an unfortunately short lifespan. Sadly, giant breeds don’t tend to live as long as medium and small-sized breeds, primarily because they age more quickly.1

In this post, we reveal the average Mastiff’s lifespan and share tips on how to offer your precious pup the best possible quality of life so they may live longer.

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Mastiff Average Lifespan

The average Mastiff lifespan ranges from 6 to 10 years. This is pretty standard for giant breeds; to give a few examples, the Great Dane’s life expectancy is 7–10 years, and the Saint Bernard’s is 8–10 years. The average life expectancy for giant breeds in general is 8–10 years, and for large breeds, it’s around 10–12 years.

Medium and small-sized dogs fare better, with the average lifespan ranging from 10–15 years for small breeds and 10–13 years for medium breeds.

brindle mastiff dog standing in the middle of the park
Image By: Ricantimages, Shutterstock

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How to Care for Your Mastiff for a Long Lifespan

The truth is that in spite of estimations, it’s impossible to tell exactly how long your dog will live because so many factors go into this. Properly caring for your Mastiff increases their chances of living longer and enjoying a great quality of life, though, so let’s go over the basics of Mastiff care.

woman hugging a black tibetan mastiff
Image By: Veronika Kraeva, Shutterstock

Feeding & Diet

As giant dogs, Mastiffs are more at risk of suffering from skeletal conditions and growth disorders like hip dysplasia. For this reason, it’s essential to feed them a diet appropriate for their size with the right amount of protein and the correct calcium/phosphorus ratio. A safe calcium/phosphorus ratio for giant puppies is usually 1.1:1 to 1.4:1 if the dog is fed a healthy amount.

Furthermore, the formula you choose shouldn’t be too high in calories because giant and large breeds need to eat fewer calories per unit of body weight. Foods formulated for large/giant breeds by high-quality brands should cater to these requirements.

These formulas tend to have less fat and often contain additional omega-3 fatty acids, glucosamine, and other ingredients that are good for the joints. Nevertheless, you should always take care not to overfeed your dog, as this could cause weight gain, which places pressure on the joints. We strongly urge Mastiff parents to discuss the ideal diet with their vet, as different dogs have different needs.

Bloat is another risk for large and giant breeds, and this can be very dangerous in dogs. To help prevent this, split meals into two or three per day rather than giving all the food in one go.

You should also avoid exercising your dog right before or after they’ve eaten (it’s often recommended to wait at least 2 hours after eating), and you shouldn’t use elevated bowls for feeding.


It’s best to get your Mastiff checked by a vet at least once per year, though twice per year is recommended for older dogs. You’ll also need to keep up with their vaccinations (rabies, distemper, etc.). Your vet can help you get set up with a vaccination schedule for your puppy or adult dog.

Regular vet checkups—in addition to offering an appropriate, high-quality diet and monitoring your dog’s weight—are essential because Mastiffs are prone to various health conditions, including hip dysplasia, skeletal disorders, bloat, cancer, and eye issues.

Other risks include degenerative myelopathy (a spinal cord disease that causes hind limb weakness and paralysis) and epilepsy. If you get a Mastiff puppy from a breeder, always look for a reputable and responsible one that conducts health screenings.

Sick mastiff dog sitting on table in a vet clinic
Image Credit: UfaBizPhoto, Shutterstock

Environment & Emotional Health

Caring for a dog isn’t just about feeding and walking them. It’s also about providing them with an environment in which they can feel safe and loved. All dogs need a warm, clean home to live in—they should under no circumstances live outdoors—where they’re given plenty of love and opportunities to socialize, bond, and play with you and other members of the family.

It’s also sensible to dog-proof your home to ensure your Mastiff doesn’t get injured. Unsecured windows are a big danger zone, as are most cleaning products, certain houseplants, and electrical wires.


Despite being such a huge dog, a Mastiff’s exercise needs are pretty moderate. Adult Mastiffs need around an hour of exercise per day, which should include a couple of walks and playtime. This helps keep your dog mentally stimulated and in good shape. Remember that bloat is a potential risk for this breed, so don’t exercise them too close to mealtimes.

Be careful when it comes to exercising Mastiff puppies because their joints can easily be damaged by strenuous activity. Begin with walks the length of no more than half a block for puppies aged 2–3 months.

english mastiff running on grassy field
Image Credit: Vira Sivachuk, Shutterstock

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The Life Stages of a Mastiff

There are four main life stages of a Mastiff: puppy, young adult, adult, and senior.

  • Puppy: Puppyhood is the first stage of a dog’s life, and in large and giant breeds, it can last up to 18 months. During this time, it is vital to provide them with food made for puppies so they get the proper nutrition as they grow.
  • Young Adult: Mastiffs are considered young adults up to the age of 3–4, and it is at this stage that they become fully mature, but they still might display some of their puppy-like behavior!
  • Adult: Giant breeds are mature adults from 3–4 up to the age of 7. At this stage, they enter the last 25% of their estimated lifespan. Since Mastiffs have reached their adult stage and aren’t growing anymore, it is important to watch how much you feed them, as obesity could become an issue.
  • Senior: Mastiffs enter the senior dog stage when they’re in the last 25% of their estimated lifespan. As a reminder, this breed is estimated to live up to 10 years. Since these are such large dogs, it is not uncommon to see issues concerning joints and mobility.
Two Fila Brasileiro Brazilian Mastiff puppies playing on the grass
Image Credit: olgagorovenko, Shutterstock

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How to Tell Your Mastiff’s Age

Looking at your dog can give you a rough idea of what life stage they’re in. A vet is the best person to give you the most accurate estimation, but even they can’t pinpoint with certainty a dog’s age without the appropriate documentation. Here are a few factors that vets take into account when estimating age.


A dog’s teeth are white as puppies, but as they age, staining and tartar buildup can occur. For this reason, vets look at the condition of the teeth to help estimate a dog’s age. This isn’t foolproof, though, as a lot depends on how well a dog’s teeth have been cared for.

Neapolitan mastiff dog man checking teeth and jaw of his pet
Image Credit: Bobex-73, Shutterstock


Graying—especially around the muzzle, eyes, and paws—is a sign of aging. It’s not common in young adult dogs, so this can help vets guess an age range.


Older dogs’ eyes tend to be cloudier than those of younger dogs, which is called sclerosis of the lens. Younger dogs can develop cloudy eyes due to various conditions, but it’s more common in older dogs.

giant mastiff up close
Image Credit: Michelle Cavanagh, Shutterstock

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While Mastiffs often don’t live as long as medium or small dogs due to their enormous size, they can still enjoy a great quality of life with dedicated care. If you’re considering sharing your life with a Mastiff, please consider one of the many wonderful shelter dogs looking for a home.

Featured Image Credit: Joseph Gruber, Shutterstock

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