American Mastiff
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You are here: Dogs > Dog Breeds > American Mastiff

American Mastiff Information

  • American Mastiff Training
  • | Temperament
  • | Health
  • | Origin
  • | Maintenance
  • | Ideal Environment
  • | Photos

American Mastiff

Thank you for using our site to find American Mastiff information. Feel free to add any information about the American Mastiff breed we may have missed. If you have any specific questions about the American Mastiff, feel free to ask them below. We've found that most breeders are more than happy to reply and answer your questions. We love your photos and reviews! We appreciate all additions to the site and we know our users value them as well. If you need help training your American Mastiff check out our dog training reviews.
American Mastiff

General Description

The American Mastiff is a large, powerful dog with a wide, heavy, rectangular-shaped head and a powerfully muscular build. The breed has a deep, rounded chest and well-sprung ribs. Their limbs are well-built, straight, and well-muscled, and their burly necks are thick and slightly arched. American Mastiffs have a long tail that reaches the hocks, and a pair of high set ears that are semi-round in shape. Their medium-sized muzzle is well-proportioned and features a black nose. American Mastiffs have teeth that close in a scissors bite and dark, amber-colored eyes. American Mastiff puppies are born darkly colored, and as they get older they become lighter. The breed’s coat can vary slightly in color, but is usually a light fawn that may or may not have some white markings.

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Character

American Mastiffs make excellent family pets as they are terrific with children and hopelessly devoted to their owners. They are dignified, mellow, calm, and quiet. While American Mastiffs are very protective, they are never aggressive. Rather, they make excellent watch dogs and only attack if their families (especially children) are in danger. American Mastiffs are social, wise, and gentle with people, and they are very patient with small children and other animals.

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Size

28 – 35 inches

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Weight

140 – 200 pounds

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General Health

American Mastiffs typically live for 10 to 12 years.
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American Mastiffs do well in an apartment setting with daily exercise. As they grow older and tend to become a little lazy, a daily walk will do, or a run in a fenced in yard. They are relatively inactive indoors.

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History

The American Mastiff was developed by Fredericka Wagner. She constructed the breed in Piketon, OH after crossing an English Mastiff with a dog thought to be an Anatolian Mastiff or Anatolian Shepherd. After much selective breeding, Fredericka Wagner was able to create Mastiff puppies with a tight lower lip line and a dry mouth.

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Maintenance

American Mastiffs have a short-haired coat that is comparatively easy to take care of. They require regular brushing and their coat can be wiped down with a cloth for a glossy sheen. They require baths and dry shampoos only as necessary. American Mastiffs are average shedders.

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Ideal Environment

The American Mastiff can do acceptably in a small household or apartment if he is sufficiently exercised. They are comparatively inactive indoors, so their ideal living conditions would consist of at least a small yard. The American Mastiff has a propensity to become lazy, but they will have a better quality of life if exercise is initiated.
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The American Mastiff is a dog that needs a job and daily exercise. Mastiffs also need rules, guidance and demand respect. With these applied you will have a great dog. If not, you may experience trouble.

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Dog Training!

If you're having problems training your dog or getting control, you should read our review of DogProblems.com. Adam will do whatever it takes to help you whip your dog into shape. I've used them to help with my Great Dane as well as help friends train their dogs. It's the first place I go to help answer users Questions. Many training issues are too extensive to answer in this forum, which is why I refer a lot of the load to his site.

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Discuss the American Mastiff breed on our Forum!

Ask a QuestionAmerican Mastiff Q&A

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I have been doing some research on both the American mastiff and the English mastiff. I have noticed on some English mastiff sites information stating that the American mastiff has a definite tendency to become really agressive. We have had Rottweilers in the past and love the breed, but I have always wanted a mastiff and am looking into the American or English. I am just a little concerned about some of the information I have been reading from English mastiff breeders. Thank you.
I have a 2 year old AM who is very unlike all the reviews we read before purchasing (from Flying W. Farms). He is very prey driven - chases anything that moves (animals, cars, you name it). Barks a lot. Drools a lot. Snapped at the vet and my father-in-law for no reason. He is certainly not the gentle giant that was advertised! During the first year, he chewed the woodwork, windowsills, furniture, steps, etc. He had plenty of toys and bones, but for some reason preferred to chew on wood. We also had a very big problem with him always trying to bite our hands and arms when we were playing with him. On his walks, he would decide to suddenly jump up on us and grab our coats or arms - this is a big problem when your puppy is 90 lbs. We worked with a trainer who suggested using a head halter which allowed us much more control over his jumping and biting. Our vet told us that he has never dealt with a mastiff that exhibits the characteristics that our's does. If I purchased another mastiff, it would definately by an English Mastiff. The main reason we purchased an AM was for less drool and good health. Our AM drools a lot, and he has skin allergies on top of it all.
I just put down my America Mastiff, saddest day of my life. She was the most gentle well behaved dogs I have ever owned. Great with children, other dogs and cats. Truly Gentle Giants. I landed here searching for another when I'm ready
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I am interested in getting an American Mastiff, but my house has two different sets of steps. Is this a problem for Mastiffs?
I have a two year old AM and he will go up the stairs, but forget about coming back down - does not like it.
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Do this breed come in fully black in color?
American Mastiff's do not. They are only, fawn, apricot, and brindle(light or dark). If black is what you want-I would go for the dark brindle. Ours is dark brindle and the only light part on him is his "tiger stripes" and he has a few patches of white on his paws and chin.
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What's the difference between an american mastiff and a american bullmastiff?
bullmastiffs are half english mastiff and half american bulldog whereas american mastiffs are half english mastiff and half anatolian shepherd. AM's drool and snore less as well.
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Upload a PhotoAmerican Mastiff Photos

American Mastiff, 3 years, FawnAmerican Mastiff, 2 years, FawnAmerican Mastiff, 2 years, FawnAmerican Mastiff, 2 years, FawnAmerican Mastiff, 1 year, FawnAmerican Mastiff, 1 year, FawnAmerican Mastiff, 2 years, BrindleAmerican Mastiff, 2 years, BrindleAmerican Mastiff, 2 years, BrindleAmerican Mastiff, 2 years, BrindleAmerican Mastiff, 2 years, BrindleAmerican Mastiff, 2 years, Brindle and Fawn
American Mastiff, 9 weeks, brindleAmerican Mastiff, 4 months, BrownAmerican Mastiff, 8 months, BrownAmerican Mastiff, 2 years, HarliquinAmerican Mastiff, 8 month, brownAmerican Mastiff, 8 months, brownAmerican Mastiff, 3.5 months, FawnAmerican Mastiff, 6.5 months, FawnAmerican Mastiff, 9.5 months, 135 lbs., FawnAmerican Mastiff, 9 months, Dark FawnAmerican Mastiff, 1 year, FawnAmerican Mastiff, 7  mon., Fawn
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Write a ReviewAmerican Mastiff Reviews

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My review of American Mastiffs

I own a 3-year-old American Mastiff named Murphy. Murphy is the most awesome dog I've ever known! He is extremely smart, loving, sweet, gentle, patient and loyal. He is a favorite everywhere we go. He has never met anyone (2- or 4-legged) that he didn't love! He was awarded the CGC (Canine Good Citizenhip Award) and is an actively working Certified Therapy Dog. NOTE: Genuine American Mastiffs can ONLY be obtained from the 12 approved AM breeders, who are members of the AMBC (American Mastiff Breeders Council).Michelle ParlierMcHenry, Illinois

Pros: On average, they drool much less than their English Mastiff cousins. Less incidence of health problems. Longer life-span. Wonderful temperament (which is guaranteed for life). Don't require a lot of grooming.

Cons: Big dogs equal big food bills and higher costs for vaccinations, etc.

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American Mastiff Information

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