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Giant breed

St. Bernard: feeding, nutrition and health

The St. Bernard is one of the heaviest breeds, and its calm, low-activity temperament brings a high risk of obesity, which places extreme strain on joints that are already under pressure. Controlling a puppy's slow growth and preventing bloat matter just as much.

St. Bernard
Weight
54–91 kg119–201 lb
Height
65–90 cm26–35 in
Lifespan
8–10 yrs
Size
Giant
Activity
Low
Adult at
24 months
Senior from
5 yrs
FCI group
2

How much food does a St. Bernard need?

The calculator starts at the breed average of 72.5 kg (160 lb). Put in your own dog's weight and the energy figure from the bag.

Couch dogWorking or sport

On the bag this is the metabolisable energy (ME). If it is given per kg, divide by 10. If it is in kJ, divide by 4.184.

Daily portion

g

oz · range g

Per meal

g

2 meals a day

Energy

kcal

resting need kcal

Usage: kg a month (a 12 kg bag lasts about days)

The full explanation of the maths is on the food portion calculator.

Feeding a St. Bernard: what matters

For a St. Bernard, slow, even puppy growth is critical. A giant-breed food with an energy density around 330 to 360 kcal/100 g and a controlled calcium-to-phosphorus ratio protects growing joints from being overloaded under the eventual weight of an adult dog.

An adult dog weighing 70 kg (154 lb) with low activity needs roughly 2,000 to 2,400 kcal a day, considerably less per kilogram than its size would suggest at a higher activity level. Split feeding into 2 to 3 meals a day because of the risk of bloat. Give your dog at least an hour of rest after eating, with no play or vigorous activity, especially in hot weather, which this breed handles poorly.

Given the breed's low natural activity, controlling the amount of food matters more than it does for more athletic giant breeds. Extra calories from treats and table scraps quickly turn into excess weight on a St. Bernard, weight that already-stressed joints tolerate poorly.

Protein in the food

23–27 %

dry matter, mostly animal

Fat in the food

10–14 %

dry matter, by activity

What to watch for

  • Body condition: excess weight is hard to spot under a dense coat on a giant breed, so check the ribs and waist by hand regularly.
  • Puppy growth rate: weigh every 2 weeks, and skip any extra calcium supplements.
  • Feeding around exercise: rest for at least an hour after eating because of the risk of bloat.
  • Heat and hydration: in summer, feed during the cooler parts of the day and ensure plenty of water.

Practical feeding tips

  • Split the daily ration into 2 to 3 meals at set times, rather than leaving food out at all times.
  • Use a giant-breed food designed for slow growth until at least 24 months of age.
  • Check the puppy's weight every 2 weeks and compare it against the breed's growth curve.
  • Reduce the daily ration by 15 to 20 percent after neutering; the risk of excess weight is high in this breed.
  • Replace fatty treats with vegetables; obesity is one of the breed's most common problems.

Feeding schedule by age

StageMeals a dayNote
Puppy 8 to 12 weeks4xA giant-breed puppy food with controlled calcium.
Puppy 3 to 8 months3-4xThe fastest growth phase; keep the puppy lean.
Junior 8 to 24 months3xStay on a giant-breed food until skeletal growth is complete.
Adult 24 months to 5 years2-3xAn adult giant-breed food, with strict portion control given the low activity level.
Senior from 5 years2-3xLower energy, joint support, and consistent weight monitoring.

Health risks that diet affects

Hip and elbow dysplasia

Very common in this giant, heavy breed. Controlled, slow puppy growth using a giant-breed food with balanced calcium, and keeping the dog lean for life, are the key prevention measures.

Bloat (gastric dilatation-volvulus)

A deep chest is a risk factor for stomach twisting. Feeding 2 to 3 times a day in small portions instead of one large meal, and an hour of rest after eating, substantially lower the risk.

Osteosarcoma

A cancer of the long bones with a high incidence in giant breeds. There's no direct dietary prevention, but keeping the dog lean reduces overall strain on the body.

Obesity

The St. Bernard has low natural activity and gains weight easily, especially after neutering. In such a heavy dog, excess weight substantially loads already-stressed joints and shortens its already short life.

Heat intolerance

A dense coat and massive build mean poor tolerance for high temperatures. This connects to diet through hydration and feeding timing: in summer, feed during the cooler parts of the day and ensure constant access to water.

Temperament and exercise

The St. Bernard is a calm, gentle giant with a low natural need for exercise. That easygoing temperament combined with its giant size means it gains weight easily if the owner feeds according to the amount on the bag without regard to actual activity.

A dense coat and massive build mean poor heat tolerance, which indirectly affects feeding too. In summer, it's best to feed during the cooler parts of the day and make sure plenty of fresh water is available.

A puppy packs on enormous weight quickly, but its skeleton doesn't finish maturing until around 24 months. Excess energy and calcium during this period directly increase the risk of hip and elbow dysplasia in such a heavy breed.

Coat: Short-coated or long-coated variety with a dense undercoat; colors range from red-brown to yellowish-brown with white.

Common questions about feeding a St. Bernard

How much should a St. Bernard weigh?

Adult males weigh roughly 64 to 82 kg (141 to 181 lb) depending on type and line, females are usually somewhat lighter, and the overall range given is 54 to 91 kg (119 to 201 lb). For such a heavy breed, condition, with the ribs easy to feel, matters far more than the exact number on the scale.

How much food does a St. Bernard need per day?

An adult dog weighing 70 kg (154 lb) with low to moderate activity needs roughly 2,000 to 2,400 kcal a day, which works out to about 570 to 685 g of a typical kibble (350 kcal/100 g) split into 2 to 3 meals. A less active or neutered dog needs less.

What food is suitable for a St. Bernard?

A giant-breed food with 23 to 27 percent protein, 10 to 14 percent fat, and a controlled calcium-to-phosphorus ratio. Given the breed's low activity, favor a more moderate-energy option over high-calorie foods marketed for active dogs.

How long do St. Bernards live?

Average lifespan is 8 to 10 years. Keeping the dog lean for life is one of the most effective factors an owner can control; excess weight substantially reduces both mobility and overall lifespan in such a heavy breed.

Why does a St. Bernard put on weight so easily?

The combination of a calm, low-activity temperament and giant size means even a modest calorie surplus quickly shows up as excess weight. The ration should be based on the dog's actual activity, not on the feeding chart on the bag, which often assumes a higher workload.

When should a St. Bernard switch to adult food?

Usually between 22 and 24 months of age, when this giant breed's skeletal growth is complete. Switching too early to a more energy-dense adult food can disrupt the slow, even growth of the skeleton and raise the risk of joint defects.

Breeds of a similar size

Sources

Last updated 2 September 2026.