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Mastweiler (Mastiff & Rottweiler Mix): Pictures, Guide, Info, Care & More!

Written by: Elizabeth Gray

Last Updated on July 5, 2024 by Dogster Team


Mastweiler (Mastiff & Rottweiler Mix): Pictures, Guide, Info, Care & More!

If you want a dog that’s dedicated to your protection and looks intimidating enough to get the job done, the Mastweiler might be just the breed for you.

Breed Overview


25–32 inches


80–160 pounds


8–12 years


Brindle, brown, golden, chocolate, silver, black and tan, black

Suitable for:

Individuals and families, those experienced and able to train and handle a large and active dog


Protective, intelligent, loyal, easy-going

This hybrid between the always alert and active Rottweiler and the imposing but calm Mastiff is the ultimate family guard dog. Best for more experienced owners simply because their size demands a firm touch with handling and training, a Mastweiler will happily take up (a lot of) space in your home and your heart! Keep reading to learn more about these calm and devoted dogs.

Mastweiler Characteristics

High-energy dogs will need a lot of mental and physical stimulation to stay happy and healthy, while low-energy dogs require minimal physical activity. It’s important when choosing a dog to make sure their energy levels match your lifestyle or vice versa.
Easy-to-train dogs are more skilled at learning prompts and actions quickly with minimal training. Dogs that are harder to train will require a bit more patience and practice.
Some breeds, due to their size or their breeds potential genetic health issues, have shorter lifespans than others. Proper exercise, nutrition, and hygiene also play an important role in the lifespan of your pet.
Some dog breeds are prone to certain genetic health problems, and some more than others. This doesn’t mean that every dog will have these issues, but they have an increased risk, so it’s important to understand and prepare for any additional needs they may require.
Some dog breeds are more social than others, both towards humans and other dogs. More social dogs have a tendency to run up to strangers for pets and scratches, while less social dogs shy away and are more cautious, even potentially aggressive. No matter the breed, it’s important to socialize your dog and expose them to lots of different situations.

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Mastweiler Puppies

Before you buy, be sure to ask the Mastweiler breeder whether their dogs have been checked for any inherited disease that either Rottweilers or Mastiffs are prone to getting. If you’d rather adopt than buy, you may be able to find Mastweilers available through local animal shelters or rescue groups. You’ll likely find adults rather than puppies for adoption since many potential owners might not have been prepared for how big their cute little Mastweiler puppy was going to get!

Take a look at the full care guide for Mastweilers so they can grow into healthy and happy dogs.

Image By: Left – Waldemar Dabrowski, Shutterstock | Right – Dolores Preciado, Shutterstock

Temperament & Intelligence of the Mastweiler

Since Mastweilers are hybrid dogs, their temperament won’t be as consistent as a purebred dog. Mastiffs, especially English Mastiffs, are more laidback than Rottweilers, and a Mastweiler usually has a calmer, sweeter temperament than the more dominant, intense Rottie. They’re watchful, loyal, and protective of their families and property.

Due to their size, early socialization and training are important to ensure that these dogs know how to behave and respect their place in the family. Mastweilers are intelligent dogs but can be hard-headed and unmotivated to learn sometimes. They are best for experienced, patient owners.

Image By: Kev Gregory, Shutterstock

Are These Dogs Good for Families?

Despite their intimidating size, Mastweilers usually take well to living with children, especially if they are raised with them. Their protective nature leads them to take on a natural guardian role with their human kids. All children should be supervised when interacting with dogs, especially with large, sometimes rowdy dogs like the Mastweiler. This mixed breed is usually less energetic and rambunctious than a pure Rottweiler, but their size can still be too much for small children.

Since they’re naturally suspicious of strangers, a Mastweiler that’s part of a family with an active social life needs especially diligent socialization. They must be taught to accept lots of friends of all ages coming in and out of their house. Mastweilers, especially Bull Mastweilers, tend toward being territorial.

Does This Breed Get Along With Other Pets?

With proper socialization and supervision, Mastweilers can get along with other family dogs. But due to their guard dog heritage, the same may not apply to strange dogs that enter their territory. Since the Mastweiler is almost always going to be the bigger dog, caution will always be needed when they interact with other canines.

Some Mastweilers, especially Bull Mastweilers, tend to chase cats. Others may get along fine with the family feline. A lot depends on the individual animals involved and the socialization and training of the Mastweiler. To avoid any predator stress, small exotic pets should be kept away from this breed.

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Things to Know When Owning a Mastweiler

If you think you have space in your home and life for a Mastweiler, the next step is to find out all you can about what’s needed to take care of this giant dog. Here are details about the everyday maintenance of the Mastweiler, as well as health concerns you need to be aware of for the breed.

Food & Diet Requirements

As you might imagine, Mastweilers eat a lot of food! They should do well on any nutritionally balanced dog food, commercial or home-cooked. Your veterinarian can help you determine how much food to feed your Mastweiler to ensure they get all the right nutrition and stay at a healthy weight.

Since bloat is such a serious concern for giant breeds like the Mastweiler, it’s usually recommended that their daily food quantity be split into several small meals to help avoid any problems.


English Mastiffs are among the least energetic of dog breeds, while Bullmastiffs and Rottweilers are active and athletic. Mastweilers generally fall somewhere in the middle when it comes to their energy level. They need daily exercise, but the intensity will depend on the individual dog.

Mastweilers need outdoor exercise to stay both physically and mentally healthy. Some will get bored or lazy if not stimulated with regular activity. Backyard playtime and long walks or hikes allow the Mastweiler to enjoy time with their family as they burn off some energy. Just keep in mind that these dogs don’t tolerate heat very well because of their size, and you should use caution if you’re exercising them in hot weather.


As with all large, powerful dogs, early and consistent training and socialization are essential for the Mastweiler to ensure that they  are under control and on their best behavior as they grow. These dogs are usually quite intelligent, but training can sometimes take some effort. While they usually bond closely with their owners and want to please, Mastweilers can also be prone to stubbornness and sometimes dominance, especially Bull Mastweilers.

Good habits and behavior are most easily taught when these dogs are young and small, so puppy training and socialization classes are a fine idea. Patient, positive, reward-based training methods work best with the Mastweiler, as they do with most dogs. Getting into a power struggle with this breed or using harsh punishment will be ineffective and might lead the dog to develop aggressive, negative behaviors.

Grooming ✂️

Despite having a short coat, the Mastweiler is not a hypoallergenic or low-shedding breed. They shed a moderate amount and need weekly brushing to help control the hair and keep their coat healthy. Mastiffs and Bullmastiffs are known for their heavy drooling, but the mix with Rottweiler tends to reduce this tendency in most Mastweilers.

Bathe a Mastweiler as needed to keep them clean and control any doggy odor. Regular ear cleaning and teeth brushing are also good ideas. Keep their nails trimmed short if they don’t stay worn down naturally. For your own sake or the sake of the veterinary staff who will one day be doing nail trims on your 100-pound dog, try to get your Mastweiler accustomed to these grooming tasks when they are still a puppy.

Health and Conditions

As a hybrid dog, the Mastweiler could inherit any health conditions that are common in either parent breed. When you search for a Mastweiler breeder, look for one who prioritizes breeding only from healthy, properly screened dogs.

Minor Conditions
  • Allergies
  • Inherited eye issues
  • Obesity
Serious Conditions
  • Hip and elbow dysplasia
  • Bone cancer
  • Heart problems
  • Bloat

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Male vs. Female

Male Mastweilers are generally larger and heavier than females. They may also be more rambunctious and dominant in personality. Males may be more prone to being territorial and aggressive than females, requiring firmer training and handling.

Female Mastweilers tend to be a little calmer and more affectionate than males. They’re still loyal and protective, but they may prioritize caring for the people in the family rather than guarding the house and property as a whole.

Neutering a male Mastweiler can help make him calmer and easier to handle. It may also help with any urine-marking issues. If you don’t spay your female Mastweiler, you’ll be dealing with a messy heat cycle about twice a year or so. Keep in mind that any medical procedure is going to be more expensive the larger a dog is, and spaying is the more expensive of the two surgeries.

3 Little-Known Facts About the Mastweiler

1. They can be a mix of Rottweiler and any type of Mastiff.

The most popular type of Mastweiler is the mix of a Rottweiler with an English Mastiff, sometimes distinguished as an English Mastweiler. Another common type is the Bull Mastweiler, a cross of the Rottweiler and Bullmastiff.

2. English Mastweilers were designed with a purpose.

It’s believed that the English Mastweiler was created by dog lovers in England looking to create an ideal working and guard dog with the mellow temperament of a Mastiff and the energy and agility of a Rottweiler.

3. Individual Mastweilers can look quite different.

The common denominator among all Mastweilers is that they’re going to be big, powerful dogs. Aside from that, they could be one of several different colors and coat patterns. Their actual size can also vary quite a bit depending on what kind of Mastiff the Rottweiler is mixed with and how big both parents are.

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Mastweilers won’t fit, sometimes literally, into every household and living situation. Those who are up for the challenge of living with these courageous beasts must make sure they can afford both the expense and the time it takes to train and socialize this breed. A Mastweiler will literally help protect your investment, along with your home and family!

See also:

Featured Image Credit: Digging dog, Anne, Flickr, Attribution CC 2.0

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