American Masti-Bull

100-150 lbs
23-29"
United States
American Bulldog
Mastiff
The American Masti-Bull is a hybrid breed created in the 1960s in the United States. The breed was developed by breeding the American Bulldog with the Mastiff to create a large to giant dog who can be loyal and affectionate with his family, as well as an aggressive guard dog when needed. The Masti-Bull needs little grooming, but will drool a lot, often more than first time owners will expect. While not a highly active breed, this dog does need daily exercise to prevent boredom vices and keep him healthy.
purpose Purpose
Gaurd dog
history Date of Origin
1960s
ancestry Ancestry
American Bulldog, Mastiff

American Masti-Bull Health

Average Size
Male American Masti-Bull size stats
Height: 23-32 inches Weight: 100-150 lbs
Female American Masti-Bull size stats
Height: 23-29 inches Weight: 100-150 lbs
Major Concerns
  • Elbow Dysplasia
  • Progressive Retinal Atrophy
  • Hip Dysplasia
  • Hypothyroidism
  • Seizures
Minor Concerns
  • Demodectic Mange
  • Cherry Eye
  • Cataracts
  • Skin Allergies
  • Bloat
Occasional Tests
  • Eye Examination
  • Skin Samples
  • Neurologic Exam
  • Internal Imaging (x-ray, CT scan, MRI, etc.)

American Masti-Bull Breed History

The American Masti-Bull is an American made hybrid dog that is a cross between an American Bulldog and a Mastiff, also known as the English Mastiff. This hybrid breed is also known as the American Bandogge Mastiff, a term which can get a little confusing. It is used to designate hybrids made from the crossings of any type of Bulldog with any type of Mastiff. Originally, this hybridization was thought to have started in the 1960s with two specific breeders, namely John Swinford, an American veterinarian who wanted to breed the best guard dog, and Joe Lucero, who called his dogs American Bandog Mastiffs. The American Bulldog is more similar to 17th century bull-baiting dogs from Great Britain than the English Bulldog, and is believed to have come to the United States during the colonial period and used as bull, bear, and buffalo baiters. In the southern states, they were used by farmers to catch feral pigs and cattle. The modern American Bulldog can trace its roots to these southern ancestors who survived in Alabama and Georgia. The breed gained popularity in the 1980s as a guard and family dog, but is still not recognized by the AKC. The Mastiff is also called the English Mastiff, and was originally bred as a guard dog. The date of origin of the Mastiff is unknown, but Caesar left written documentation about the breed in 55 B.C. after the Romans had invaded Britain. Even earlier accounts of Mastiffs have been found on ancient Egyptian monuments dating back to 3000 B.C. The Mastiff was recognized by the AKC in 1885.

American Masti-Bull Breed Appearance

The American Masti-Bull is a large hybrid dog that is bred by crossing an American Bulldog with a Mastiff. Though shorter than a Mastiff, it retains the giant dog’s thick bones. Like the Bulldog, it is heavily muscled, and can weigh over 100 pounds. A large and deep chest is supported on strong legs. A well-muscled neck supports a head with bulldog characteristics on a wider scale. A short snort leads to a wide nose. The coat is comprised of fine, short hair that is dense and close to the body. Coat colors can range from brindle, fawn, brown, black, blue, red, and white. Any colored coat can have white markings.
Eye Color Possibilities
brown American Masti-Bull eyes
Brown
Coat Color Possibilities
black American Masti-Bull coat
Black
brown American Masti-Bull coat
Brown
fawn American Masti-Bull coat
Fawn
brindle American Masti-Bull coat
Brindle
red American Masti-Bull coat
Red
gray American Masti-Bull coat
Gray
blue American Masti-Bull coat
Blue
Coat Length
coat
Short Medium Long
Coat Texture
coat texture
American Masti-Bull straight coat texture
Straight Wiry Wavy Curly Corded

American Masti-Bull Breed Maintenance

The American Masti-Bull requires little in the way of grooming, as it only sheds moderately. The fine, short hair of this breed needs a regular brushing with a firm bristle or rubber brush to cut down on shedding by removing dead hair and dandruff. An occasional bath will keep the coat clean and healthy, but should not exceed once a month. The American Masti-Bull is not a hypoallergenic breed. Regularly monitoring and cleaning the ears and eyes can reduce the risk of infections. Also, monitoring the skin for any signs of allergies or infections can alert you to the problems that the breed may be at risk for.

American Masti-Bulls often suffer from elbow dysplasia, cherry eye, and other potentially expensive health conditions. Secure pet health insurance today to avoid high veterinary care costs. Our pet insurance tool lets you compare plans from leading companies like Figo and Spot. Find the “pawfect” plan for your pet in just a few clicks!

Brushes for American Masti-Bull
Slicker Brush
Slicker Brush
Brushing Frequency
fur daily fur weekly fur monthly
American Masti-Bull requires weekly brushing
Daily Weekly Monthly

American Masti-Bull Activity Requirements

The American Masti-Bull is a gentle giant and an affectionate family companion, who thrives on attention. This outgoing and playful dog gets along well with children, and may even become the babysitter. He can be an excellent guard dog when he perceives a threat, and is only openly aggressive to strangers in these circumstances. If provided with good socialization early on, the Masti-Bull can live peacefully with other household pets. If this important socialization does not occur, it could result in aggression towards other dogs. This is a loyal and intelligent breed, but needs a confident and strong leader. Training can be challenging for first time dog owners who may be unfamiliar with dog communication. The American Masti-Bull can change from gentle companion to aggressive protector quickly, so an ideal owner for this breed is someone who is familiar with dog instincts. It is important to establish the rules early on, as this large breed can be fearless and stubborn. This moderately energetic breed needs regular exercise, such as walks or trips to the dog park, or else can develop unwanted destructive behaviors when left alone.
Activity Level
low activity medium activity high activity
Low Medium High
Minutes of Activity Per Day
60 minutes
activity minutes

American Masti-Bull Owner Experiences

tank
6 Months
2 People
House
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
dont have any this is the first time
1 month, 3 weeks ago
George
5 Years
2 People
Apartment
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Laying in the sun
Play
Tug-of-war
Shake
Look out the window
cuddle
I fostered George for 2 weeks at the beginning of this year & just couldn't let him go (I knew that would happen) He's a 115lb American Bulldog-Mastiff, white with brown spots. I'm 5'2, but strong & mighty – he thinks he's stronger than me, it's an ongoing battle. George sleeps all day, with the occasional burst of energy at 1pm, when I'm usually in a meeting on zoom. We go on 2-3 walks a day. He's gets a little too excited around other dogs, and has a bit of a prey drive when he sees small dogs, but we're working on it. He intimidates most people, which is understandable. People are usually stunned or scared by his stature and size although he's a big lover and LOVES people. Sometimes he's a little strange towards tall heavier set men, I think that may have something to do with his past. At home when we have guests, he'll greet you by leaning against you and cover you in hair, or even plop his butt right down on your feet. Maybe a dominance thing? As most big does are, he thinks he's 20lbs and will try to sit ON you on the couch. I laughed at another person's submission about their dog gutting and destroying toys like a lion – that is very much what George does. He throws his ropes and stuffed animals up in the air like a killer whale. His slobber is whole other conversation, but I love his face jowls, so I can't complain. He doesn't like loud noises; trash trucks, fireworks, HATES the vacuum (he tries to attack it) We've conquered that situation though. I had him sit next to the vacuum for 10 minutes while it ran & gave him treats, so he views the vacuum at treat time instead of wanting to kill it, lol. His strength is what impresses me the most. When I got him, he was about 97lbs and had horrible hip issues. He was SO skinny; his ribs & hip bones stuck out of his body. The foster agency told me he had a hard time running or going up stairs. It's been about 3 months, he's 115lb now, runs like a champion, dominates stairs, and is SO STRONG. Watching him run on grass is like watching Usain Bolt, insane. He's as healthy as he's ever been, and I truly believe his hip issues have subsided with the exercise I give him/the food he eats/all around healthier lifestyle instead of being at a shelter. Highly recommend this big ol lover of a dog. Long Live Georgie!
1 month, 3 weeks ago
Rex
4 Years
3 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Tug-of-war
Play
Catch treats
Shake
Look out the window
Eating Snacks
I got him Friday November 26th. He loves to sniff and look out the window.
5 months, 3 weeks ago
Jake
6 Years
6 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Jake is my Baby he is loving, non aggressive loves all kids. He loves attention and very protective but he does listen he only barks when he detects an unknown person or animal near the house. He loves to talk
6 months, 2 weeks ago
Erman
1 Year
5 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Dog Parks
Look out the window
Run
Walk
Chase
my very first lovable bly dog i have ever own but a little BIT AGGRESIVE
7 months, 4 weeks ago
Goosey
7 Years
1 People
Apartment
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
We adopted Goosey a couple months after our last American Bulldog - English Bulldog mix named Muscles passed after 13 years. Goosey is a beautiful soul, who is a gentle giant that weighs 123 pounds. I am a women of fairly the same size of Goosey and I have to use a choke collar to walk him bc sometimes he goes a little nuts when he sees other dogs similar to his stature. We are working on that though as he was adopted from a rough situation. Goosey is the most loving and playful and smart Bulldog I have ever interacted with, leading us to think think that he is not a true American Bulldog but a mastiff mix. He is also HUGE, big boned and 123 pounds. He is VERY smart and has learned new words at the age of 7 and he understands most things when I speak to him. He knows what Zoom is and comes up to the screen. To greet others when I’m on a conference call. He LOVES Toys and will gut and destroy them like a lion - I’ve even seen him toss them in the air, like he is hunting. He is a true lover and loves all people although can be weary around strange tall larger men - also think something happened to him. His intelligence is the most impressive to me but similar to what others have said he is very afraid of loud noises and gets super jumpy although this has improved since his move to Venice Beach. I love him and would 100 % recommend to adopt this lovable super smart breed of doggie.
9 months, 1 week ago
Reagan
1 year 6 months
4 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
I couldn't have asked for a better dog than my mastibull Reagan. Ever since he was a puppy he was very easy to train and obedient. Training was never an issue with him, he was quickly potty trained and learned commands very quickly. He's amazingly gentle around small children, children younger than 7 years of age are at our home constantly and he let's them hang all over him. While very protective of his home and family, he has never bit or even niped at anyone, even when he was a puppy. Since he is a guard breed, he's very protective of our home which has a large fenced in yard. He let's almost everyone who walks by know who's yard it is! Our Mastibull also is constantly on alert. Reagan religiously checks all the rooms in the house and all windows (we have a large old home with 40+ windows) at least once a hour during the day, and gets up every few hours at night to check the house for anything out of place. On to his appearance, Our mastibull took heavily to the mastiff side of his genes. While not as tall as a standard mastiff he's still built very large. He weighs around 115 pounds and is still growing into his body. While very large, he's very athletic and quick. He manages to get from the back of our large yard to the from in a matter of seconds. He has a fawn coat, very large head, and a very muscular and intimidating frame. Overall, I couldn't ask for a better combination of a loving family dog and intimidating protector of his home and family!
4 years, 5 months ago
Diesel
7 Years
1 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Diesel considers himself a human, and he is interested in anything he sees my son doing. He was quite the chewer as a pup, but grew out of that stage quickly. He is highly intelligent, and learns at an impressive speed. He understands verbal commands, as well as hand gestures, but can be very defiant and stubborn when HE chooses to be. He was crate trained as a pup, and never, seriously NEVER has any accidents in the house. He is very affectionate with people he knows and loves attention, but also aggressive towards strangers and other animals. He tolerates small dogs, but not cats or larger dogs. He very much likes children, as long as they don't scream or pull his ears or tail. He doesn't handle loud noises well at all...he is mostly afraid of loud bangs and gunfire, and a human yelling or screaming makes him nervous. His personality is quite interesting, as he is sensitive and gets his feelings hurt easily. He turns his back and pouts when he doesn't get his way, and if I tell him I'm going to get a puppy he runs and hides! He is extremely protective of his immediate family, and his house and yard, and he loves to swim, but hates bath time to the point that he will growl and nip at me...you can't even say the word BATH around him, because he will hide. Diesel is mostly brindle in color, with a white patch on his chest, and white patches on his toes of all four paws. He weighs about 140-145 pounds, and his back is wide and about 2 1/2 feet from the ground, his head reaches about 3 feet. He's very large!
4 years, 3 months ago
Mojojojo
5 Years
3 People
House
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Love them just had another litter after 4 years and love them even more
3 years, 11 months ago
Takoda
14 Months
3 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Awesome family dog. Loves people and enjoys meeting new people. Though still intact I have had no problems with did on dog aggression. Gets along well with the 2 cats living in the house.
3 years, 9 months ago
Tank
5 Months
4 People
House
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
We all love him very much and miss him when at work. He has a big yard and house to live in. He's smart but tries to hide it I think, he also uses psychology on us.
3 years, 1 month ago
Rosco
4 Years
2 People
Apartment
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
He is an amazing dog! strong smart and very loving.
3 years, 3 months ago
Haka
2 Years
4 People
House
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Dog Parks
Hike
I’ve had this dog for about five months now and have loved almost every moment of it. He is definitely a gentle giant who rarely barks, unless a strange man approaches him. Unfortunately he didn’t have the happiest life before I adopted him and that’s where his fear of man originates from. Other than that he is a wonderful, friendly, gentle dog. Given that his earlier life lacked training I had to potty train him and work on other commands. He honestly learned very quickly and I was extremely impressed. I think this dog is a wonderful family dog. He’s interacted well with children of varying ages and always wants to be next to you and cuddled. However given that he is part bulldog I need to be aware that he will shred things when he’s bored. I definitely had to invest in toys that would last longer and were sturdier. I do notice he sheds pretty much daily which means I brush him pretty much every day and have to sweep the floors every day. Although no dog is the same, I think that this breed of dog seems overall wonderful and I would recommend it to anyone looking for a fairly large dog.
2 years, 10 months ago
Maia
6 Years
2 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Got her from a shelter after suffering from neglect, abuse, starvation, mange, staph and yeast infections and severe hair loss. She weighed less than 20 lbs when she was turned in as a stray by her "owner". I traveled from Texas to Ohio to adopt her. She is extremely affectionate and acclimated to our other rescue dogs & kitties very quickly. This is not to say that there weren't a couple of tussles with the other 2 dogs but, instead of easily killing either (who are only 34 and 40 lbs), she chose to let them know she is not interested in being aggressive but won't take it, either. With everything she's been through, she's so very congenial, loving and eager to please. She now weighs 70lbs and has her beautiful Brindle coat back. It is our intention to let her live her remaining years being spoiled, happy and loved.
2 years, 9 months ago
Betsy
4 Years
3 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Walk
Run
Look out the window
Catch treats
Play
Chase
Hide & Seek
Speak
Shake
Dog Parks
Eating Snacks
Laying in the sun
Playing in the snow
Amazing breed very smart and loyal. Gentle and playful and protective at the right moments.
2 years, 9 months ago
Diesel
5 Years
2 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Amazing Dog very loyal and loving. He thinks he is a lap dog at 105 lbs. Lots of energy and lots of sleeping unless were doing something and then hes on over watch keeping us safe!
2 years, 8 months ago
Sirius Black
2 Years
6 People
Apartment
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Chase
Cuddling
Tug-of-war
Playing
Running
We have only had our boy 3 weeks. He has had no training and is just now starting to respond to commands. Jes very gentle with a 13 month old baby and our 20lb cat. Although he doesnt realize how big he is sometimes and will smother people when cuddling. He wraps his arms around us for hugs and love to lay close. He still needs some work but overall he is a loving gentle giant.
2 years, 6 months ago
Archie
5 Years
4 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Going on runs
Sleeping
Go Camping
Camping
Cuddles
Shake
Hiking
Car rides
Archie is a very friendly and loving dog, he doesn't like loud noises or yelling, he gets very nervous and will run and hide, he loves children but if there are more than 4 he tends to get nervous and anxious and gets slightly aggressive if he feels trapped around people. He likes other dogs but other dogs dont like him because hes so big. He currently weighs 87lbs and goes through a big bag of dog food ever 2 weeks. He has helped me with my depression and has kept me alive on multiple occasions. My dog is my best friend and I couldnt ask for a better companion.
2 years, 6 months ago
Buster
7 Years
5 People
House
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Tug-of-war
Hide & Seek
We have had our boy since he was a puppy. 7 years now and his a gentle giant. He loves cuddles and trys to sit on your lap even though his way to big to be doing that. He loves kids. He never barks or shows aggression except when he senses something bad about someone then his ears go back, hair stands up and growls. He loves his tucker and boy can he eat. His tall with a big wide head, very muscular chest and huge paws. His a fawn colour with white markings on his chest and feet. His very loved by our family
2 years, 4 months ago
Buster
5 Years
2 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Catch treats
Walks
sleep
Buster is very loyal but very jealous. He is used to being the center of attention. If he is not getting attention he will “sass” or use head head or paw to get your attention. He is generally around 115-120 lbs. He loves to cuddle and lay in the sun. He had acl surgery back to back when he was 2 yrs old. He liked to jump down the stairs and sometimes over furniture. This has slowed him down considerably. He is prone to allergies and ear infections. He has been my best travel buddy. His bark is definitely worse than any bite!
2 years, 3 months ago
Rousey
2 Years
4 People
House
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Catch treats
Tug-of-war
Walks
Fetch
Bath time
Swimming in pool
Car rides
Ball
She is one best dogs ive owned and i have had at least two dogs for the last 30 years. She is super affectionate, loving, and loyal with family members including our other 2 dogs and our 2 cats that come indoors. The outside cats are a different story. She chases them relentlessly. She can be taught but it takes a lot of consistency and repetition. She is incredibly attentive and smart and extremely protective. She tolerates people who visit but only after multiple times seeing them. Overall Rousey is secretly everyone in our families favorite dog. We also have a minuature bull terrier and a boston terrier. We love all our dogs. The omly thing i caution about this breed is the extreme protective nature. We even had weeks of classes we went to with her as a puppy but she still will not tolerate strangers or other unfamiliar animals. If i am with her i can keep her calm but i would not be surprised if she bit a stranger entering the yard.
2 years, 3 months ago
Penelope
6 Years
2 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Belly rubs
Walk
Fetching balls.
Anything that involves water
She's a lovely dog. She is excellent with children. A little too clumsy with small children. She loves other dogs. Unfortunately she is a digger. I got her when she was almost 2. I still can't walk her on a leash easily. She drags me when she gets excited. Having a fenced yard helps considerably. PNell weighs in around 85 to 95 pounds. She's just a very sweet dog, that my son brought over and asked if I could dog sit. That was 4 years ago.....
1 year, 11 months ago
Nahla Siala
2 Months
2 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
She is the best dog, the first time bringing her home was a handful but as time went on and the more training she did while being inside for a while she got use to peeing in the designated areas we tell her to pee. Also, she will wait for us to wake up in the morning so she can do her morning poos then she’ll get treated for behaving so well. She gets a little too distracted at times which is concerning and kinda annoying at times but once I pull out her treats, she straight away listens. She’s so easy to maintain, by far the best dog I’ve ever owned and they’re good dogs for people with mental heath issues which is why I bought her for my partner. She’s perfect and adorable, so I highly recommend a Masri Bull.
1 year, 6 months ago
George
7 Years
4 People
House & Yard
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Playing
Play
We've had George since he was 6 months old. Friendly Giant, loves attention & cuddles. Crys if you're busy! Chases cats relentlessly, even our own sometimes. Very protective of our smaller dogs. Gets frightened at loud noises or raised voices, always looking for food! Loves eating our Almonds and sunbathing! We have a farm in the Spanish mountains, hot and dusty! Ear infections, Eyes are good! A bit overweight now so I need some advice!
1 year, 3 months ago
Rolo
8 Months
6 People
House
Health
Grooming
Friendliness
Energy
Trainability
Pastimes
Ball time
Walk
Running
Absolutely lovely dog! Would not have any other type of breed in the future! Love love love him
1 year ago
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Question - New pet
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need to find a this breed for sale or adopt

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Question - Nutrition
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What amount of food should I be giving my 7 year old male. I've tried cutting his food down a little and exercising him more, but he doesn't seem to be losing weight. I rarely give him treats either! Starting to worry a little and Vets here are not so used to bigger dogs

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Question - Behavior
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9 month old American bull dog Mastiff cross. Most loving dog I have ever owned. Cleared the fenced in backyard and attacked an off leash dog that wandered onto the property. I have since fixed the fence issues. He is not neutered yet but I do have an appointment for 10 months from now. I am realizing that he is a natural guard dog and I have never owned one. Any advice would be appreciated

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Question - New pet
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need to find a this breed for sale or adopt

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