Great Dane nutrition: growth, bloat and grain-free diets

A Great Dane puppy fed as much as it wants will grow faster than its skeleton can handle, and bloat is the most common killer of adult Danes. Most of the nutrition decisions for this breed follow from those two facts. The American Kennel Club breed profile gives males as 30 to 32 inches (76 to 81 cm) and 140 to 175 pounds (64 to 79 kg), females as 28 to 30 inches (71 to 76 cm) and 110 to 140 pounds (50 to 64 kg), and a life expectancy of 7 to 10 years.

Daily calories for an adult Dane

Published calorie ranges for "Great Danes" are too broad to be much use, because a 50 kg female and a 79 kg male differ by more than a thousand calories a day. A better starting point is the formula in the Merck Veterinary Manual. Resting energy requirement (RER) is 70 times body weight in kilograms raised to the power 0.75. An intact adult needs roughly 1.8 times RER, a neutered adult 1.6 times, and a dog that gains weight easily 1.4 times.

Figures are rounded to the nearest 5 kcal. They are a first estimate. Plenty of adult Danes are calm indoor dogs and need less than the table suggests. Use the dog's lean weight, then adjust by body condition every few weeks: ribs easy to feel under a thin layer, a visible waist from above, and a belly that tucks up behind the ribs.

Older Danes usually need fewer calories as activity drops. There is no single senior figure; weigh the dog monthly and trim portions when the weight creeps up. The AKC's breed health notes are blunt that a heavy Dane has a shorter life and more trouble moving as it ages, and that weight goes on easily but comes off slowly.

Growth in the first 18 months

Giant-breed puppies are not harmed by eating too little so much as by eating too much. In a German feeding trial, Great Dane puppies fed freely developed more skeletal growth disorders than littermates fed 70 to 80% of that amount, and fast growth was linked to limbs that angled outward. The aim is a lean puppy growing steadily, not the biggest puppy in the class.

Calcium is the other trap. When researchers in the Netherlands fed growing Great Danes diets with extra calcium, the puppies developed rickets-like changes, and osteochondrosis lesions appeared once their intake was brought back to normal. A second group given extra calcium and phosphorus together grew more slowly and also showed osteochondrosis. Merck describes the same pattern: very high dietary calcium makes osteochondrosis worse in fast-growing large-breed dogs.

In practice: feed a complete puppy food made for large or giant breeds, measure it, and add nothing to it. No calcium, no bone meal, no mineral supplement. A complete food already contains what the puppy needs, and the extra is where the harm in these studies came from.

Not every limp is a feeding problem. The AKC describes panosteitis, an inflammation of the growing long bones, as a mild and usually self-limiting cause of lameness in young Danes; the limp often moves from one leg to another. Any lameness, swollen joints or a puppy that seems unwell still needs a vet visit, because the more serious developmental bone diseases look similar at first.

Meals for a growing Dane

• Three measured meals a day for young puppies, moving to two meals a day by about six months.
• No free feeding. Food left down makes it impossible to control intake and teaches fast eating.
• Weigh every two weeks and check body condition. Cut the portion if the puppy is getting round, even if the bag suggests more.
• Treats and chews count toward the day's calories.

The AKC advises waiting until a Dane is 2 years old before jogging or hiking with it, to protect joints that are still developing.

Bloat and how to feed around it

Gastric dilatation-volvulus (GDV) is a stomach that fills with gas and twists on itself, cutting off its blood supply. It kills quickly without emergency surgery, and the AKC ranks it first among causes of death in the breed. Using published incidence and lifespan data, one analysis put the lifetime risk of GDV for a Great Dane at about 37%, the highest of the five breeds examined.

The best evidence on everyday risk factors comes from a US study that followed 1,637 large and giant dogs, Danes among them, for several years. Risk rose with age, with a close relative that had bloated, with fast eating and with a raised food bowl. The bowl finding overturned years of advice to raise the bowl, and the authors attributed about half of the cases in the giant breeds to it.

• Split the daily ration into two or three meals rather than one.
• Feed from a bowl on the floor.
• Slow a fast eater with a slow-feed bowl or by scattering kibble on a mat.
• Keep vigorous exercise away from mealtimes. The AKC advises this, although the research evidence for it is weaker than for the points above.
• Ask the breeder whether parents or littermates have bloated. Family history was one of the risk factors in that study.

Signs of GDV include a swollen or tight belly, retching that brings nothing up, drooling, restlessness, pale gums and collapse. A dog showing them needs a vet immediately, at any hour.

For a breed at this level of risk, ask about prophylactic gastropexy, an operation that fixes the stomach to the body wall so it cannot twist. It is often done at the same time as neutering. In the same analysis, preventive gastropexy reduced the expected risk of dying from GDV in Great Danes about 30-fold. It does not stop the stomach filling with gas, so the signs above still mean an emergency visit.

Heart disease and grain-free diets

Dilated cardiomyopathy (DCM) is a disease in which the heart muscle weakens and the chambers stretch. It is common in Great Danes, and the FDA's own summary describes DCM as a recognized genetic condition of large and giant breeds, naming the Great Dane. It can stay hidden for years and then show as fainting, exercise intolerance, a cough, fast breathing at rest or sudden death. Cardiac screening by a veterinary cardiologist, usually an echocardiogram with a heart rhythm check, is how it is found early. In that study of 124 Danes, a blood test for cardiac troponin I was a useful addition to screening, not a replacement for it.

Diet came into the picture when the US Food and Drug Administration began collecting reports of DCM in dogs eating certain foods. In the reports it received, most diets were grain-free and 93% contained peas or lentils. The FDA did not establish that these foods cause DCM and, in December 2022, said it would publish no further updates until there was meaningful new science.

For a Dane, that leaves a cautious approach. There is no benefit to choosing a grain-free, pulse-heavy food, so a complete diet that includes grains and meat is the simpler choice. A Dane already eating a grain-free food, or one showing any of the signs above, should have a cardiac work-up; the vet may also check blood taurine. Taurine, L-carnitine and fish oil are sometimes used alongside treatment, but that is a decision for the vet managing the heart disease, not a preventive routine for a healthy dog.

Joints and body weight

The AKC lists hip dysplasia among the conditions breeders should screen for. For an adult Dane, keeping the dog lean is the one joint measure an owner fully controls, and it matters more in a dog carrying 60 kg or more than in a small breed. Joint supplements such as glucosamine, chondroitin and fish oil are widely sold for giant breeds, but there is no established dose or proven preventive benefit for Great Danes; discuss them with the vet rather than adding several at once.

Practical feeding points

• Food choice: a complete food for the dog's life stage, with large or giant breeds on the label for puppies. The AKC advises giving table scraps sparingly, avoiding cooked bones and fatty foods.
• Stools: large meals of a low-calorie food can mean large, soft stools. A more energy-dense food fed in a smaller volume sometimes helps, but it also makes overfeeding easier, so measure carefully.
• Water: fresh water available at all times.
• Weighing: an adult Dane is too heavy to weigh by holding it on a bathroom scale, so use the walk-on scale at the vet clinic once a month. Many clinics allow a quick weigh-in without an appointment.
• Food changes: switch gradually over about a week.

Sources

1. Great Dane dog breed information. American Kennel Club.
2. Nutritional requirements of small animals. Merck Veterinary Manual.
3. The effect of a different energy supply for growing Great Danes on the body mass and skeletal development. Zentralblatt für Veterinärmedizin, Reihe A, 1995.
4. Effects of diets with different calcium and phosphorus contents on the skeletal development and blood chemistry of growing great danes. The Veterinary Record, 2000.
5. Benefits of prophylactic gastropexy for dogs at risk of gastric dilatation-volvulus. Preventive Veterinary Medicine, 2003.
6. Non-dietary risk factors for gastric dilatation-volvulus in large and giant breed dogs. Journal of the American Veterinary Medical Association, 2000.
7. Long-term outcome and troponin I concentrations in Great Danes screened for dilated cardiomyopathy. Journal of Veterinary Cardiology, 2023.
8. FDA investigation into potential link between certain diets and canine dilated cardiomyopathy. US Food and Drug Administration.