The Leonberger is a magnificent gentle giant, a calm, eager-to-please working breed that grows into 45 to 75 kg of dog. Its lovely temperament makes it a joy to train, but its sheer size and slow-growing frame mean the cost of every mistake is measured in kilograms and in joints. Most problems relate to managing that size early and protecting the body. Here are the five mistakes that cause the most trouble, and what to do instead.
1. Waiting to start training
A behavior that is merely cute in a fluffy puppy, jumping, pulling, leaning, becomes genuinely difficult to manage in a 70 kg adult. Owners who wait until the dog is older miss the window when it is still physically guidable. Start gentle manners, leash work, and handling at 8 weeks, so the giant adult already knows the rules while you can still enforce them.
2. Over-exercising during growth
The Leonberger is a giant, fast-growing breed, and too much high-impact exercise, running, jumping, stairs, while the growth plates are open damages developing joints for life. Owners who exercise a giant puppy like an adult dog cause lasting harm. Keep activity low-impact and flat-ground (swimming is ideal) until 18 to 24 months, then build up gradually.
3. Allowing jumping and leaning
A Leonberger puppy jumping up or leaning affectionately is adorable, which is exactly why owners allow it, and then a 70 kg adult does the same thing and knocks over a child or an elderly guest. Set the boundary while the dog is small: reward four-on-the-floor greetings and a polite "off", so the gentle giant never learns to put its weight on people.
4. Harsh handling
The Leonberger is sensitive and genuinely eager to please, so harsh corrections are both unnecessary and damaging, distressing the dog and eroding the trust that makes the breed so cooperative. Owners who apply pressure get an anxious giant. Use reward-based methods only; this breed wants to work with you, and kindness brings out its best.
5. Exercising in the heat
That thick, double coat is built for cold mountain work, and the Leonberger overheats easily in warm weather. Owners who exercise it hard on hot days risk dangerous overheating. Schedule activity for the cool parts of the day, offer shade and water, lean on swimming, and never push a panting Leonberger.
What works with Leonbergers
Start training early while the dog is manageable, protect the growing joints, set size boundaries before they matter, handle gently, and exercise in cool conditions. The throughline is matching your management to the size and the sensitivity at once: do both and the Leonberger is a calm, manageable, devoted gentle giant.
TailorPup's Leonberger plan front-loads the manners that matter for a giant, structures exercise to protect joints, and uses gentle reward-based methods.
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Related: How to Train a Leonberger · Leash Pulling · Recall Training