Most important facts
- Group
- Working
- Size
- Giant
- Weight
- 68–100 kg
- Lifespan
- 6–10 years
- Coat
- Short, dense
- Energy
- Low
- Height
- 70–91 cm
- Colours
- Apricot, fawn or brindle
- Shedding
- Moderate
- Est. feeding cost
- ~£72/mo
- Gear to consider
- Orthopaedic bed, slow-feeder bowl, sturdy harness and lead
Typical dry food, adult
About the Mastiff
The Mastiff is one of Britain's most ancient breeds, with powerful war dogs described by Caesar when he landed in Britain and prized lines kept at estates like Lyme Hall for centuries. The breed was reduced to a bare handful of dogs by the end of the Second World War, and was rebuilt with the help of stock sent back from America and Canada. Its size still commands attention, its temperament rarely warrants it.
Mastiffs are often described as gentle giants, and with good early socialisation that reputation generally holds. They are typically calm, loyal and good-natured with their own family, watchful rather than aggressive with strangers, and patient with children, though their sheer bulk means supervision around toddlers is essential. Train with a consistent hand from puppyhood, as a grown Mastiff that pulls is a handful.
Because they are so large-bodied, Mastiffs are not high-energy dogs and are content with moderate daily walks, with no need for long runs. This suits their joints as much as their laid-back nature. They can be prone to separation distress and do best with plenty of company, with a settled, calm feeding routine supporting a steadier dog.
Common health conditions
Things Mastiff owners commonly watch for. Guidance, not veterinary advice.
Gastric dilatation-volvulus (bloat/GDV)
Large, deep-chested breeds like the Mastiff are at heightened risk. Split meals across the day, slow a fast eater with a slow-feeder bowl and rest them after food.
Hip and elbow dysplasia
Common in giant breeds. Keep a puppy on a controlled-growth diet and an adult lean to take pressure off the joints.
Eyelid abnormalities (entropion/ectropion)
Loose facial skin can cause eyelids to roll in or droop. Keep up regular vet checks and ask breeders about eye screening.
Dilated cardiomyopathy
A heart-muscle condition seen more often in giant breeds. Book regular vet checks and keep weight healthy to spare the heart.
Feeding a Mastiff
What and how a Mastiff is fed changes markedly across life stages. Puppies need a giant-breed food with controlled calcium and phosphorus, kept moderate in calories to slow growth and protect developing joints. Rapid growth in giants is strongly linked to dysplasia. Feed to a target growth curve rather than free-feeding, and weigh puppies regularly.
As adults, portion control is essential, since extra weight loads the joints and heart heavily. Bloat is a risk in Mastiffs. Feed two or three meals across the day from a slow-feeder bowl. Keep strenuous exercise an hour away from eating. Moderate, high-quality protein suits most adults, and joint-support nutrients earn their place too.
Every dog is different — weight, age and activity all shift what a Mastiff needs. The turns these breed tendencies into a shortlist matched to your dog’s age, size, budget and needs.
Typical adult weight
68–100 kg
Est. daily calories
1,990–3,100 kcal
A broad guide for an average-activity adult in good body condition — not veterinary advice. Real needs vary with age, neutering, activity, health and body condition, so no two Mastiffs eat exactly the same. Get a personalised estimate or estimate feeding costs.
- Per day
- ~£2.38
- Per month
- ~£72
- Per year
- ~£870
A broad typical monthly budget guide, not a live price quote. Food format, calorie density, pack size and retailer pricing all change the real cost.
Find the right food for your Mastiff
Foods ranked to your dog
Answer a few quick questions and the Food Finder ranks foods to your Mastiff by score, price, life stage and fit.
Breed at a glance
- Exercise needs4/10
- Appetite9/10
- Trainability6/10
- Good with children8/10
- Shedding5/10
- Tolerates being alone3/10
The good & the worth-knowing
The good
- Calm, loyal and gentle with its family
- Naturally watchful without being aggressive
- Low exercise needs for such a large dog
Worth knowing
- Size alone means training, transport and vet costs need real planning
- Prone to bloat, joint disease and heart conditions typical of giant breeds
- Facial wrinkles and drooling need regular cleaning to avoid skin irritation
Best matched accessories
All accessories →The collections that suit the breed, judged by the same independent standard.
Common owner questions
How much should I feed my Mastiff?
There's no single figure because Mastiffs vary hugely in adult size. Feed the amount stated for your dog's actual weight on the packaging, then adjust to body condition. You should be able to feel, but not see, the ribs. Our Food Finder can help work out a suitable daily amount.
Is bloat something I need to worry about?
Yes, bloat is a genuine risk for deep-chested giants and can be life-threatening, so know the warning signs, a swollen abdomen, unproductive retching and restlessness, and treat them as an emergency. Smaller, more frequent meals and calm mealtimes are sensible everyday precautions.
How long should a Mastiff puppy stay on puppy food?
Giant breeds mature slowly and typically need a large-breed puppy food until 18 to 24 months, since it supports steady growth and discourages rapid growth. Moving to adult food too early can raise the risk of developmental joint problems.
Do Mastiffs need much exercise?
Not as much as their size suggests. Around an hour a day is usually plenty, split into a couple of gentle walks. Puppies need considerably less while their joints develop. A healthy weight does more for a Mastiff's joints and heart than extra exercise ever could.