Bull Mastweiler

80-120 lbs
23-25"
Unknown
Bullmastiff
Rottweiler

The Bull Mastweiler is a very large animal, although it stops just short of being a giant dog. They are a popular cross breed of two powerful and protective animals, the Bullmastiff and the Rottweiler. These dogs are family oriented and are naturally protective, but they are very powerful animals and interactions with smaller children and animals should be closely supervised to prevent injuries due to either abnormal aggression or, more likely, over-exuberant play behaviors. These dogs tend to be quite intelligent and tend to be easy to train, but they can occasionally lean toward the stubborn side, particularly if their training is begun late in their lives. This dog should not be confused with the Mastweiler, a cross between the Mastiff and the Rottweiler, which is typically a larger and more sedentary hybrid.

purpose Purpose
Companion, Guarding
history Date of Origin
1990s
ancestry Ancestry
Bullmastiff, Rottweiler

Bull Mastweiler Health

Average Size
Male Bull Mastweiler size stats
Height: 24-27 inches Weight: 90-130 lbs
Female Bull Mastweiler size stats
Height: 23-25 inches Weight: 80-120 lbs
Major Concerns
  • Hip Dysplasia
  • Bloat
  • Osteochondritis Dissecans
Minor Concerns
  • Elbow
  • Hypothyroidism
  • Retinal Detachment
Occasional Tests
  • Hip
  • Elbow
  • Thyroid Tests
  • X-Rays
  • Physical Examination

Bull Mastweiler Breed History

The Bull Mastweiler is a popular hybrid, a cross between the Bullmastiff and a Rottweiler, both large and capable dogs that have traditionally been employed as guard dogs and family protection animals. The Bullmastiff is the only guarding breed dog that was developed in England, originally a crossbreed itself, a combination of the English Bulldog and the English Mastiff. They were developed to be guards of the grounds and game on large English estates protecting them from poachers and thieves; the Mastiff was too large and slow for the job, and the Bulldogs of the time didn’t have the restraint needed to prevent mauling of the poachers. The Bullmastiff is a smaller, more agile breed than the Mastiff and a larger and more controlled animal than the Bulldog of the time. The Rottweiler is a German dog, a breed old enough that their full origins are obscured by history, although it is believed by most that they were the descendants of large Roman dogs that drove cattle for the cattlemen and butchers, known as drover dogs, sometime prior to 700 A.D. They were named for the area that they were developed in, a site known as Rottweil for the abundance of red, Roman tiles that were unearthed there. Although their popularity declined during the industrial revolution in the 1800’s, it was rekindled in the 1900’s and they were often employed as police or military animals. The hybrid of the two is less aggressive and more intelligent than the Bullmastiff as well as calmer and less stubborn than the Rottweiler. 

Bull Mastweiler Breed Appearance

This crossbreed produces large to very large canines that are well-muscled with a nearly square appearance, although the dogs are usually slightly longer than they are tall. Their heads are broad and flat, with either round or almond shaped eyes in dark brown that should have an alert expression and their ears are V-shaped or triangular, sit high on the head, and fold down either to the front of the face or to the sides of the head.  They sport short, dense coats which may have a thick undercoat if they lean towards the Rottweiler genetics. The Bull Mastweiler may take its coloration from either side of the family and may come in the traditional Bullmastiff colors of red, fawn, or brindle, as well as mixes of these colors, or they may lean towards the Rottweiler side equation and have black & rust, black & mahogany, or black & tan coloration. Many have black, white, or brindle markings and dark masks are also common.

Bull Mastweiler Breed Maintenance

These dogs are somewhat simple to handle when it comes to grooming as this hybrid’s short coat is quite manageable. Although they require regular brushing with a curry comb or soft bristle brush to control the shedding and distribute their body oils, monthly baths are usually adequate for these dogs. If your dog has inherited the folds or wrinkles commonly seen on Bullmastiffs, care should be taken on a regular basis to ensure that the folds of skin have not trapped any moisture as it can cause skin irritation and a foul odor may develop. They shed moderately year round, although Bull Mastweilers with a double coat tend to shed more heavily than those with a single coat. 

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Bull Mastweiler Temperament

The Bull Mastweiler has been developed from two consummate guard dogs, and as such makes a fantastic guard dog as well. Like both parent breeds these dogs are alert and protective animals that are very dedicated to their families. They are generally good with children, although interactions should be closely supervised due to their large size and power; these dogs are playful and may accidentally knock over smaller children, especially if either the child or the dog is young. In some cases, protective may become overprotective and although they are unlikely to intentionally hurt a child, they are more likely than other breeds to cause damage an adult that they consider a threat to a child in their family. In order to prevent aggressive behavior, early socialization and training is crucial. They are an intelligent dog that was bred to work closely with people and although they can show some stubbornness, they tend to pick up on training very quickly, particularly if it is started when they are young. 

Bull Mastweiler Activity Requirements

Although the Rottweiler is a very active breed the Bullmastiff typically requires less exercise than average for a dog of their size, so 60 to 90 minutes of vigorous activity a day is usually sufficient. Along with daily walks, these dogs are adept at drafting and carting activities, agility training, tracking, and obedience training. During your dog’s formative years it is important to keep exercise sessions somewhat shorter by breaking them up throughout the day and to ensure that your dog does not roughhouse or jump from a significant height as this can damage the still forming bones and joints. This crossbreed prefers the room that a house provides, but if given extra exercise 2 to 3 hours a day, they may be able to adapt to apartment life as they don’t tend to bark much. 

Bull Mastweiler Owner Experiences

Simba
4 Years
2 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Simba loves to take walks and play fetch.also loves to take car rides but loves to set on the console of the car between the sets and lay in passenger lap.ln the yruck just lives to stand on the console between the sets
1 month ago
Nala
1 Year
4 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
swimming
Running
Napping
I rescued my dog Nala off of a Native Reservation late August 2020. She is the sweetest girl, loves people (except for some men) and gets along well with other dogs.
3 years, 3 months ago
Joe LaDouche
2 Years
4 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Fetch
Walk
Rescued from an abandoned farm at about 8weeks. Took two seconds to fall in love with him. Two days to house train him. Shows signs of separation anxiety so for the most part he goes everywhere with me. He's been my best friend since the day he came home
7 years ago
Eleanor
8 Weeks
4 People
House & Yard
Health
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Friendliness
Energy
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Pastimes
So far so good. Eleanor has been a great addition to our family!
6 years, 10 months ago
Binks
8 Weeks
3 People
Apartment
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Tug-of-war
Walk
Nap
Fetch
I have a little 8 week old bull mastweiler, I have only had her for 5 days but she is amazing and I love her soo much already. She used to bark a lot and just shriek in her kennel when I would have to leave for work, but this has gotten way better in a matter of days. Also in a matter of days shes learned only to poop and pee on the puppy pads. Shes so sweet and laid back but is always up for play time. I love my bull mastweiler!
6 years, 9 months ago
Zoey
7 Years
4 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
She loves walks
Walking her
This is the most intelligent dog I have ever owned. I would also say the friendliest dog I have ever had. She is 110 pounds but a gentle giant. If we get on there dog it will be a Bull Mastweiller.
6 years, 8 months ago
Jody
6 Months
2 People
House
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Trail walking
I've had him since he was 8 weeks and he is very loving and playful. Very easy to train but also very stubborn. He has bad anxiety so I separate myself from him throughout the day and he is getting better. But he loves to be at my heels wherever I go.
6 years, 7 months ago
BO
2 Years
1 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
I came across BO at my local dog rescue,at first glance i thought what the ekk!Glad he's behind bars.A week later i adopted him,best dog,breed ever!Loves to play,play an play.this breed also has a sensitive side very gentle rarely barks but lets out the cutest of howl's when he wants
6 years, 7 months ago
Mason
4 Years
2 People
House
Health
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Friendliness
Energy
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100 Hundred percent positive, One of the best dogs I’ve ever owned. Highly trainable, athletic and very smart
6 years, 6 months ago
Tanner
16 Months
2 People
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Grooming
Friendliness
Energy
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A well behaved dog who learns very fast. Enjoys meeting other dogs on his daily walks.
4 years, 10 months ago
Boss
8 Years
6 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
He is the most gentle giant
4 years, 7 months ago
Loki
6 Months
3 People
Apartment
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Run
Play
Tug-of-war
Cuddles
Fetch
Walks
Playing in the snow
I just got a 6 month old bull mastweiler and he's my best puppy ever! He's super shy to new people due to previous owner beating him but he's quickly opened up to our family and other dog!
4 years, 7 months ago
Bonro
3 Years
3 People
House & Yard
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Grooming
Friendliness
Energy
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He is so playful and loyal to the master. Liked everyone’s attention but only obey the master. Lucky 🍀 to have him. His strength should be never challenged.
4 years, 5 months ago
Bella
1 Year
4 People
House
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
cuddle
Play
Walk
Run
Bella is always super hyper, she is very independent, BIG, thinks she is a teddy bear and will hug you, put her paws on you, or lean on you everywhere.
4 years, 1 month ago
Ella
14 Months
3 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Fetch
Tug-of-war
daily walks
Dog Parks
By far the best pet I’ve ever had. Ella is nothing but a joy. Loves attention, and always wanting to play, but very wary of strangers, and protective of her yard if you’re new. Such a gentle girl with our toddler, yet rambunctious with master, which is a sign of her intelligence to tailor her style of play to the human she is interacting with. Couldn’t see myself getting any other breed.
3 years, 12 months ago
Spike
3 Years
3 People
House & Yard
Health
Grooming
Friendliness
Energy
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Great family dog. He has a lot of “chill”
3 years, 10 months ago
Animal Expert Question Icon
Question - Other
Question

Is an overbite common in this breed? I have a 13 week old female that has a pretty extensive overbite. It doesn’t seem to effect her eating however she does make a huge mess when she gets a drink.

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Question - New pet
Question

Anyone you know would sell or put some Rottweilers or bull mastiffs for sale or adoption

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Question - My pet
Question

Are Bull Mastweiler's recognized by akc or any other organizations?

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Book me a walkiee?
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