American Molossus Dog Breed: Characteristic, Health & Fun Facts!

The American Molossus is a new-age hybrid cross between two of the most affectionate and loving dogs. The American Bulldog and the Neopolitan Mastiff. As large as these dogs are, larger is their heart and affliction towards protecting and loving their owners.

These dogs are energetic companions who are gentle and loving. They are intelligent and independent. Usually, there isn’t a behavioral issue when it comes to these dogs, but they have a strong will.

Training them with love and patience can make them obedient. They learn quickly and possess really good manners while interacting with other dogs as well as their own family!

American Molossus Dog Breed

About The Breed

The American Molossus is often seen as a giant, intimidating dog. However, these dogs have hearts of gold! Many pet owners prefer this crossbreed for they are gentle and giving when it comes to affection.

They are obedient and, at the same time, self-sufficient making them the best companion dogs! They are also easy to train and look the part of a magnificent crossbreed between the English Mastiff and the American Bulldog.

They bring out the best of both these breeds. Classy guard dogs who are gentlemen and protective but also loyal and proactive. 

These dogs may not be the best choice for a novice pet owner since they are high-energy functioning dogs and prefer the outside sun from time to time.

Their large size and appetite for activity may not be the best mix if you are a new owner. However, with some time, seasoning, and professional training, they can be obedient and affectionate!

American Molossus Dog Breed History

The American Molossus comes from a cross between the American Bulldog known for its fierce protective skills, the short and stout gentle soul, and the Neopolitan Mastiff.

The Neo Mastiff was known to be a guard dog as well! Both of their parents bringing protection and loyalty to the table makes the American Molossus also protective. This also drives them to be agile and loving towards their pet owners and family, reinforcing their ideals. 

American Molossus Dog Breed Job Card/Overview

Breed Name American Molossus
Other NameMolossian Hound 
Dog Breed TypeMixed Breed
OriginEngland and Egypt
Parent BreedsNeopolitan Mastiff and American Bulldog
Height23-26 inches
Weight 60-100 pounds
Life Expectancy7-10 years 
Coat TypeShort coat
Common ColorsBlakc, Brown, Grey
Grooming NeedsBrushing regularly and maintenance 
HypoallergenicLow shedders
TemperamentLoving, openly affectionate and loyal
Apartment LivingMay not be ideal for apartments
Pet-FriendlyMaybe if pursued 
Health ConcernsCherry Eye, Obesity, Elbow Dysplasia, Dermatitis 
Overall HealthGood
Intelligence LevelIntelligent
TrainabilityEasy to train and obedient
Energy LevelHigh energy and agility
ActivityModerate exercise 
Litter Size3-8 puppies
What To Know
• American Molossus dogs are huge, so make sure you have enough space at home for them to move comfortably.

• They’re loyal and protective, but early training helps them get along with family and friends.

• Due to their size, keep an eye on their health—regular vet visits, a good diet, and watch for joint issues.

• These dogs need daily exercise, so be ready for walks and playtime to keep them happy and healthy.

• Their short coat makes grooming simple, but regular care for nails, teeth, and ears is essential.



The American Molossus dog is a big buddy with a knack for adaptability. Surprisingly, they fit well in apartments as long as they get their playtime. They’re not just massive; they’re also loyal pals, quickly becoming part of your family.

Though protective, a bit of early mingling helps them make friends easily. Whether you’re in a bustling city or a quiet town, these dogs are cool.


Adaptive to Apartment Living

Suitable for New Owners

Sensitivity Scale

Comfortable Being Alone

Comfortable with Cold Weather

Comfortable with Hot Weather


The American Molossus dog, despite its impressive size, is a gentle giant. Known for its friendliness, this breed forms strong bonds with its family. Early socialization helps them get along well with both family members and new faces.

Their affectionate nature makes them great companions, dispelling any fears associated with their imposing appearance.

All About Friendliness

Lovable with Family



Frank with strangers


American Molossuses are extremely energetic. They demand moderate exercise and need to stay in shape and healthy like all other dogs. Apart from this, they are big on expression. They make sure their love and admiration for their families are heard and felt.

Because of their large size and self-sufficient nature, they may come off as closed off sometimes. To combat this, it is important to form a bond with your dog and help them become sociable.

For them to listen to you more actively and be obedient, you could also engage a professional trainer who works on consistently improving their behavioral aspects. 


The American Molossus dog is a loyal and protective companion. Starting with a gentle nature, they form strong bonds with their family.

Early socialization helps them be well-behaved, though they may be cautious around strangers. Training from the beginning refines their protective instincts, making them devoted family guardians.

Friendly with kids

The American Molossus dog is renowned for its friendly and gentle nature, making it an excellent companion for families with children. These giant dogs often form strong bonds with kids due to their calm demeanor and inherent protective instincts.

While their size can be imposing, supervised interactions and early socialization ensure a safe and positive relationship between the dog and the children.

Amicable to other pets

American Molossus dogs can coexist harmoniously with other pets when introduced properly. Their sociable nature allows for positive interactions with other animals in the household.

However, attentive supervision is necessary, especially with smaller pets, to prevent unintentional intimidation or harm due to the Molossus’s size.

Barking tendencies

the American Molossus may result in occasional barking, serving as a natural guard dog. To maintain a peaceful living environment, early training is essential to establish boundaries and guide appropriate barking behavior.

Proper training ensures that their alertness contributes positively to home security without becoming a disturbance to neighbors.

Possibilities of Staying Alone

American Molossus dogs may find it challenging to be alone for extended periods. These dogs form strong attachments to their families and may experience separation anxiety.

Gradual training, familiarizing them with solitude, and providing engaging toys can help ease their anxiety and ensure their well-being when left alone.

Pros and Cons of the American Molossus Dog Breed


  • American Molossus dogs are known for their loyalty and protective instincts, making them excellent family guardians.
  • They have a gentle and friendly nature, making them suitable companions for families with kids.
  • With a short coat, grooming requirements are straightforward, requiring minimal effort.


  • Their considerable size may pose space challenges and require careful supervision with smaller family members.
  • American Molossus dogs may experience separation anxiety when left alone for extended periods.
  • Their protective nature may result in occasional barking, necessitating training to manage excessive noise.

Male vs Female Attitude

There is practically no difference between the male and female American Molossus. Size may be a singular aspect of differentiation. Otherwise, these dogs are loving, protective, and loyal just as much. 

American Molossus Dog Breed


The American Molossus makes a striking impression with its massive size and strong build. Sporting a broad head and a gentle gaze, these dogs have a calm yet confident demeanor.

Their short coat is easy to maintain, requiring minimal grooming. Despite their imposing appearance, they are known for their friendly nature and make loyal companions.

Coat Color And Grooming

The American Molossus has a short and trim coat and lots of skin folds and waves coming from their parent breeds. They have a short coat that is dense and does not require very meticulous grooming. Their coats come in brown, black, grey, and other monotone colors.

They have sensitive skin. Thus, excess bathing and hygiene techniques could cause issues, thus giving them a bath when required. Wrinkles on their coats and faces should be regularly cleaned to ensure no debris collects.

This helps them stay clean and fresh. Nail grooming is an important part of a dog’s hygiene. Trim their nails regularly and make visits to your veterinarian to keep their physical self healthy as well. 


The American Molossus does not shed much. Their short coat requires only a weekly brushing to keep the little shedding that occurs in check. Coat wipes are also essential!


The American Molossus is a large-sized dog. They stand tall at about 23-26 inches and tend to be on the heavier side. They outgrow some owners and reach human shoulders well within nine months. Do not let this intimidate you; however, they are just as loving!


Usually, the American Molossus is a healthy breed; however, since they are a cross/ mixed breed, not coming from a responsible breeder could cause a few problems to flare up. Apart from this, they are prone to a few health conditions that their ancestors may also have been prone to, 

These include cataracts, elbow dysplasia, cherry eye, obesity, hip dysplasia, etc. 

To keep these conditions in check, visit your veterinarian regularly and make sure you are taking care of the nutritional aspects of your dog’s diet. 

Health and Grooming Requirements

Shedding Quantity

Drooling Capability

Effortless to Groom

Overall Health

Capable of Gaining Weight


Maintenance and Care

The American Molossus does require activities to keep itself busy physically and mentally. Mental stimulation is a pillar of their health. Ours engaging in exercise can cause them to become standoffish and behavioral issues could crop up.

Keep them involved in at least an hour’s worth of walks every day and games like fetch and tug of war. They are strong and agile; thus, they will enjoy activities that help them put their strength to use.

Make sure you feed them well but avoid overfeeding as obesity tends to become an issue with this breed at times. Physical exercise can also help them channel their energy and improve how they behave. 

Food and Nutrition

An active dog means a full and filling diet. A full and nutritious diet ensures your dog can be active. Make sure you include high-energy components in your dog’s diet and keep them healthy.

They may not be extremely energetic, but their large size is a factor to consider while deciding their diet plan. Discuss your dog’s health and energy requirements with your veterinarian to come up with an efficient diet plan.

Exercise and Activity Level

The American Molossus comes from a lineage of guard dogs and thus does require some physical exertion to stay content. These dogs are not highly energetic but do have moderate requirements.

40 minutes to an hour of exercise every day can keep these dogs content both physically and mentally and keep them occupied. This helps them stay fit and sociable and also acts as an outlet for any latent energy.

The outlet also makes them obedient and prevents any behavioral issues from coming up. They could be a little stubborn and independent, but professional training and regular physical games outdoors can help these issues for owners. 

Physical Requirements

Energy range


Exercise Requirements

Capable for Playfulness


The American Molossus dog is trainable and responds well to positive training methods. Begin early with socialization and basic commands to build a strong foundation.

Their loyalty makes them eager to please, but a patient approach works best due to their independent streak. Establishing a routine with gentle guidance and rewards helps shape their protective instincts positively.


Effortless to Train


Capable for Mouthiness

Tendency to Attack Prey

Urge to Howl or Bark

Wanderlust Ability


The American Molossus has been known to be the world’s largest puppy. They have been called ‘gentle giants’ lovingly by popular owners. Since they are a fairly new breed, they may not be an available breed up for adoption everywhere, but they are pretty popular in their circles!

Explore More Dog Breeds…

FAQs On The American Molossus Dog Breed

Where do the American Molossusbreeds come from?

These dogs are a cross between the Neopolitan Mastiff and the American Bulldog. They originate from England and Europe historically but are popular in America. 

What is the best diet routine for an American Molossusdog?

A diet that is rich in energy at the same time does not contribute to obesity, or weight retention is important. Make sure you meet their growing needs!

How much exercise is required for an American Molossus?

Moderate exercise of 40 minutes to an hour of exercise keeps these dogs engaged. Take them on walks or runs, or have them play a tug-of-war match with you!

Was this article helpful?

Leave a Comment