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Nicole Cosgrove

June 18, 2021
The Mastweiler is a giant cross or mixed breed. She is the pup of a Bull Mastiff and a Rottweiler. Her life span is 10 to 12 years and she is multi-talented taking part in various roles and activities such as police work, guard dog, watchdog, tracking and obedience. She is a happy and confident dog and needs experienced owners.
Here is the Mastweiler at a Glance
Average height 24 to 27 inches
Average weight 80 to 130 pounds
Coat type Straight, dense, short, water-repellent
Hypoallergenic? No
Grooming Needs Moderate
Shedding Moderate
Brushing Brush every other day
Touchiness Quite sensitive
Tolerant to Solitude? Low – can suffer from separation anxiety
Barking Occasional to frequent
Tolerance to Heat Moderate to good depending on coat
Tolerance to Cold Moderate to good depending on coat
Good Family Pet? Excellent
Good with Children? Very good to excellent with socialization
Good with other Dogs? Moderate to good – needs socialization
Good with other Pets? Moderate to good – needs socialization
A roamer or Wanderer? Moderate to average
A Good Apartment Dweller? Moderate – needs room and a yard
Good Pet for new Owner? Low – needs experienced owners
Trainability Moderately easy for experienced owner
Exercise Needs Quite high – will need to be kept fairly active
Tendency to get Fat Very high – food should be measured and exercise done daily
Major Health Concerns Heart problems, Bone cancer, Bloat, Hypothyroidism, Eye problems, Kidney and Bladder Problems, Knee Problems, Cancer
Other Health Concerns Joint dysplasia, Pano, Allergies, Skin Problems
Life Span 10 to 12 years
Average new Puppy Price $300 to $650
Average Annual Medical Expense $485 to $585
Average Annual Non-Medical Expense $515 to $615

Where does the Mastweiler come from?

The Mastweiler is a designer dog, one of many in fact, which are mixed dogs that have been deliberately bred. You want to find someone who actually has knowledge and is a good breeder but there are a lot of backyard breeders and puppy mills that see the popularity of designer dogs and breed to make money only. Take care then where you buy from. Because these are dogs are from that first litter there can be a lot of differences in looks and personalities even in the same litter. As with a lot of these dogs we do not have an origin story on the Mastweiler so here is a look at the parents to get a better feel for their background.

The Rottweiler

This breed comes from a mastiff-type dog the Romans brought with them to Germany to drive cattle. The mastiffs bred with local dogs along the way. In the South of Germany 600 years later a red tiled villa’s remains were discovered during an excavation and led to the town being renamed das Rote Wil. For centuries these dogs were used to drove cattle and for protection against thieves when the cattle was sold. They were also used to pull carts of meat. When rail came the breed almost disappeared but in the early 20th century breeders took notice and saved them. Over the years they have been used in police work and as a working dog. They came to America in the late 1920s and became very popular. Unfortunately bad breeders jumped on that wagon and the breed got a bad reputation for temperament and health problems so demand decreased.

Thankfully today breeders are turning this around while fighting the prejudice people still have against this great dog. He is calm and confident, brave but not aggressive unless he perceives a threat to his people. He tends to be aloof with strangers, he is intelligent and he while he is trainable he can have a stubborn streak. Females tend to be more affectionate and easier to control than males.

The Bullmastiff

The Bullmastiff is not that old, he was bred in the mid 1800s in England and is essentially a cross between the English Mastiff and the English Bulldog. He was most likely bred by gamekeepers who needed a dog who was large, brave and fast to track poachers and hold them down until the gamekeeper caught up. At the time he was also known as the Gamekeeper’s Night Dog and he would work with the gamekeeper then go home with him and be a companion and family dog. When poaching became less of a problem he was then used as a guard dog. It was the early 1900s when he was bred to become a purebred rather than just kept as a crossbreed. He was recognized by the KC in 1924 and the AKC in 1933.

Today he remains a confident and brave dog, clever and sometimes independent but still reliable and obedient when well trained. He will act as your protector and is not only a great watchdog he will also act to defend if there is a threat.


The Mastweiler is an intelligent and loyal dog, very devoted and affectionate to her family and protective too. She has a lot of energy and is very playful and alert. She is a great companion and family dog when she has the right socialization and training. Her protectiveness can turn to aggression which is why the socialization and training are so important. She can be quite charming and loves to spend time with her people, in fact she does not do well being left alone for long periods and can suffer from separation anxiety. She will want lots of attention and she will need lots of outdoor time to stay well behaved.

What does the Mastweiler look like

This is a large to giant dog weighing 80 to 130 pounds and standing 24 to 27 inches tall. She has flappy ears and her coat is straight, short and dense. Common colors are fawn, golden, brown and black. She is a muscular dog, tall, with a deep chest, squared head and long tail.

Training and Exercise Needs

How active does the Mastweiler need to be?

She is best not in an apartment as she needs room to move around and a yard where she can explore and play is a very good idea. She should be given at least a couple of hours a day of physical activity. This could be in the form of two long walks, some time off leash somewhere like a dog park, joining you for your exercise, or play time. She can jump high so make sure that yard is fenced correctly.

Does she train quickly?

With an experienced owner this is a moderately easy dog to train. It will not need a lot of extra time and effort but it will be gradual. She can be independent sometimes and she needs positive techniques because of her sensitivity. Encourage and praise her, use treats as motivation though watch that she does not get too many as she does like to over eat. Be consistent and fair and also be firm. Early socialization is very important with her, her protective side can turn to aggression without the training and socialization.

Living with a Mastweiler

How much grooming is needed?

The Mastweiler is a dog that can shed a low to moderate amount. She has moderate grooming needs. As well as brushing her every other day to remove dead hair and dirt she will need her teeth brushed at least two to three times a week. She should also have her ears checked once a week for infection and then give them a wipe clean. If her activity does not naturally wear down her nails they will need to be clipped taking care not to cut too low down. Bathing should happen just when needed otherwise you can end up causing her skin to dry out.

What is she like with children and other animals?

With that early socialization and at least basic obedience training she can get on well with children. If they are part of her family she will be more affectionate, protective and playful with them but her size means that the young ones can get knocked over by accident so some supervision is a good idea. The socialization helps her be good with other dogs and with other pets too.

General information

She is a very good watchdog and will act to defend the family if needed. She barks occasionally to frequently so that may need training to control. She should be fed 4 to 5 cups of a good quality dry dog food each day. However being prone to bloat it should be split into at least two meals. It should also be carefully measured to prevent obesity.

Health Concerns

There are health concerns she can inherit from her parents such as Heart problems, Bone cancer, Bloat, Hypothyroidism, Eye problems, Kidney and Bladder Problems, Knee Problems, Cancer, Joint dysplasia, Pano, Allergies and Skin Problems. She can also have a sensitive stomach and be prone to ear infections.

Costs involved in owning a Mastweiler

A Mastweiler puppy can cost between $300 to $650. There will be a need for some medical procedures like shots, deworming, micro chipping, blood tests, a physical and spaying. She also needs a collar and leash, food bowls and a crate. These initial costs come to about $500. Annual medical costs assuming there are no major needs come to between $485 to $585. That covers pet insurance, vaccinations, flea prevention and check ups with the vet. Annual non-medical costs come to between $515 to $615 and that would be for basics like food, training, license, treats and toys.


Looking for a Masweiler Puppy Name? Let select one from our list!

The Masweiler is a large dog and she will need some specific things to make a great family dog. Space, plenty of exercise, attention, socialization and training for example are all key to how she behaves and her well being. If you are an experienced dog owner and you are prepared for all of these things she could be a wonderfully loving, devoted and happy family dog.

Featured Image Credit: Kev Gregory, Shutterstock

Nicole Cosgrove

Nicole is the proud mom of Baby, a Burmese cat and Rosa, a New Zealand Huntaway. A Canadian expat, Nicole now lives on a lush forest property with her Kiwi husband in New Zealand. She has a strong love for all animals of all shapes and sizes (and particularly loves a good interspecies friendship) and wants to share her animal knowledge and other experts' knowledge with pet lovers across the globe.

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