Leonberger

Personality

The Leonberger is often described as a gentle giant, and the AKC standard backs that up, calling a gentle, even temperament essential in this family companion and describing a self-assured, steady and playful dog. PetMD describes the breed as loyal, patient and calm, and gentle with children when well socialized.

Leonbergers crave affection and want to be part of the household. Most are happiest lying near their people, and they cope poorly with long stretches alone. A bored or isolated Leonberger can turn to chewing, digging or barking. They are generally friendly and tolerant, but their sheer size means every interaction needs management, from greetings to playtime.

Many remain puppyish for years. A young Leo may be goofy and clumsy, and an adolescent weighing 100 lb can topple a toddler without meaning to. Early socialization and training are essential. A well-raised Leonberger tends to be a calm, loving and surprisingly sensitive presence who thrives on gentle guidance and a lot of company.

History

The Leonberger is named after Leonberg, a town in southern Germany. In the 1830s, Heinrich Essig, a local breeder and the town's mayor, claimed to have created the breed. His claim is disputed, but he is credited with naming and registering the dogs; the earliest registered Leonbergers were whelped in 1846. A popular legend says the breed was meant to echo the lion on the town's crest.

In both world wars the dogs hauled ammunition carts, and the breed nearly disappeared. Only a handful survived World War I, and almost all were lost in World War II.

Two breeders, Karl Stadelmann and Otto Josenhans, get the credit for saving it, and today's Leonbergers trace back to just eight dogs that survived. The AKC recognized the Leonberger in the Working Group on January 1, 2010. Today they are mainly companions, and some enjoy swimming, carting and other jobs.

Appearance, coat & colors

A Leonberger is big, well-muscled and graceful, and it carries its head high. The AKC standard lists adult males at 28 to 31.5 in (71 to 80 cm), with 30 in preferred, and females at 25.5 to 29.5 in (65 to 75 cm), with 27.5 in preferred. The standard sets no weight, but the AKC lists typical weights of 110 to 170 lb (50 to 77 kg) for males and 90 to 140 lb (41 to 64 kg) for females.

The double coat is long and profuse over a dense, water-resistant undercoat, and males carry a mane over the neck and chest. The standard accepts lion-yellow, golden to red, red-brown and sand (cream or pale yellow), plus any blend of these. Every color comes with a black mask, and the nose and lips are always black.

The mask gives the breed a distinctive, lion-like face. Males and females look noticeably different, with males larger and carrying the fuller mane.

Training

Leonbergers are intelligent and eager to please, and they are generally easy to train when training is consistent and kind. PetMD recommends working with an experienced trainer or owner who knows the breed, and positive, repetitive methods work best. Start on day one, because behaviors that are charming in a 20-lb puppy become hazardous in an adult weighing well over 100 lb.

Priorities include loose-leash walking, reliable recall, calm greetings and not jumping up. A heavy dog pulling on the leash is a real safety issue, so teach polite walking early. Socialization is crucial, especially in the first months: expose your puppy to different people, dogs, noises and surfaces in a relaxed way.

Leonbergers are sensitive and do not respond well to harsh methods. Short, upbeat sessions work better than long drills. Many enjoy jobs such as pulling a cart or sled, swimming and agility. See our guide to crate training a puppy, and choose a large crate if you plan to use one.

Exercise

Leonbergers are calm indoors, but they need regular exercise. PetMD calls for at least one brisk outing a day, like a long walk or a hike, and notes that many enjoy a job such as sled pulling or swimming. Our guide to how much exercise a dog needs can help you tailor a plan.

Swimming is a favorite and kind to the joints. Cart pulling, hiking and relaxed games in a fenced yard are other good outlets. Keep it steady rather than extreme, and avoid hard running or jumping in puppies and in dogs with joint concerns.

Giant breeds grow quickly, so protect growing joints. Do not let a puppy do repetitive stairs, jumping from heights or long forced runs, and let your vet guide you on intensity. Heat is the main risk for a thick-coated giant, so exercise early in the morning or in the evening in summer, and carry water. Leonbergers are not suited to long runs in hot weather.

Grooming

That luxurious coat comes with a price: lots of hair. PetMD says Leonbergers shed constantly, with heavier shedding twice a year. Brush daily if you can, paying special attention to areas where mats form, such as behind the ears, the backs of the legs, the chest and the underside of the body. A pin brush, undercoat rake and a high-quality comb help.

Bathe every two to four weeks as needed, and dry the coat completely to avoid skin problems. Clean the ears every two to three weeks with a drying cleaner and watch for signs of infection. A Leonberger's ears can hold moisture after swimming.

Keep the nails trimmed, since overgrown nails on a giant dog affect the gait. Check between the pads for mats, burrs and debris. Dental care matters too, so brush the teeth several times a week. Skin allergies can cause a dry, flaky coat, so ask your vet if you notice scratching or dandruff.

Feeding

Feed a high-quality, complete and balanced diet formulated for large or giant breeds. Puppies should eat giant-breed puppy food, divided into three or four smaller meals until about five or six months of age, according to PetMD. Adults usually do well with two meals a day.

Giant dogs are at risk of bloat, a life-threatening twisting of the stomach. PetMD suggests not feeding the full day's food at once, avoiding elevated bowls and avoiding exercise right before and after meals. Learn the signs in our guide to bloat.

Monitor calories and body condition. Extra weight worsens arthritis and strains the heart. Our dog food calculator gives a starting estimate, but a Leonberger's needs depend on age, size and activity, so work with your vet. You should be able to feel the ribs under a thin layer of fat. Ask your vet before giving joint supplements or heart-supporting diets, and expect high food costs for such a large dog.

Health

Leonbergers have a shorter life span than many dogs, about 7 years according to the AKC and PetMD, and several health problems are important to understand. Cancer is a leading cause of death; osteosarcoma (bone cancer) and hemangiosarcoma are the main concerns. Bloat (GDV), a life-threatening stomach twist, is an emergency: call your vet or an emergency clinic immediately for a swollen belly, drooling or retching with nothing coming up.

Dilated cardiomyopathy, hip dysplasia and arthritis, cataracts and allergies are also reported. The breed also has inherited nerve disorders called polyneuropathies. The Royal Kennel Club describes one form, laryngeal paralysis and polyneuropathy (LPPN3), as autosomal recessive, meaning a dog must inherit the gene from both parents to be affected; it can cause noisy breathing, gagging and an unsteady, high-stepping gait. DNA tests exist for several forms.

The AKC lists hip, elbow, thyroid and eye evaluations as well as DNA tests for LPN1, LPN2 (PN), LPPN3 and LEMP. Ask breeders for full results and a family health history, and schedule regular checkups. Early attention to limping or changes in energy, appetite or breathing is especially important in giants.

Health conditions to know about

• Cancer (osteosarcoma and hemangiosarcoma) — Cancer is a leading cause of death in the breed; report limping or lumps early.
• Bloat (GDV) — Life-threatening twisting of the stomach in deep-chested dogs; needs emergency care.
• Polyneuropathy — Inherited nerve disorders (such as LPN1, LPN2 and LPPN3) that can affect walking, swallowing and breathing; DNA tests are available.
• Hip dysplasia and arthritis — Joint problems made worse by size and extra weight; screen parents and keep dogs lean.
• Dilated cardiomyopathy — An enlarged heart that pumps poorly and is a common cause of death in the breed.

Health tests to ask a breeder about

• Hip evaluation
• Elbow evaluation
• Thyroid evaluation
• Eye exam by a veterinary ophthalmologist
• Polyneuropathy DNA tests (LPN1, LPN2, LPPN3)
• LEMP DNA test

Written from veterinary sources by the Pawsplained editorial team. Not yet reviewed by a veterinarian; this is general information, not a diagnosis or treatment plan. Updated Oct 30, 2026. Editorial policy

Living with a Leonberger

Leonbergers need space, and lots of it. A large home with a securely fenced yard is ideal, and apartments are generally unsuitable for dogs of this size. Doorways, cars and furniture all matter: you will need a large vehicle, a sturdy crate and plenty of floor space. Plan too for the cost of feeding, boarding and veterinary care of a giant.

They are best with owners who are home often. Leos are social, attached dogs and may become anxious or destructive when left alone. They are usually friendly toward children and other dogs, but their size means supervision is wise, particularly with toddlers.

The thick, water-resistant coat means they tolerate cold weather well, but heat is dangerous. Keep your dog indoors with air conditioning on hot days, give constant access to water and never exercise hard in warm weather. Expect shed fur on everything. Many families find the loving, calm nature of this enormous dog well worth the cleanup.

Puppies, breeders & rescue

Finding a healthy Leonberger takes research. Look for a breeder who is active in the national breed club, openly shares health results and talks honestly about longevity and cancer in their lines. Ask for proof that both parents have hip, elbow, thyroid and eye evaluations, along with the DNA tests for polyneuropathies and LEMP that the AKC lists for the breed.

A good breeder asks you questions, too. They raise puppies indoors, socialize them to people and household noises, let you meet the mother and offer a written contract with a return clause. Be wary of anyone who sells puppies cheaply online, has no testing paperwork or offers a puppy without meeting you.

Prices vary widely, and a larger bill does not guarantee health. Leonbergers sometimes turn up in breed rescue. An adult dog's temperament and size are already known. Pet insurance is worth considering while your dog is young and healthy.