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There are at least two lines of dogs competing for the breed name
American Mastiff; neither is recognized by the American Kennel Club,
although the Flying W American Mastiff is recognized by the Continental
Kennel Club.
One line is the dryer-mouthed American Mastiff, developed by the Flying
W Farms kennel. Flying W Farms had bred English Mastiffs for decades,
but noticed several negative health characteristics incumbent within the
breed, namely hip dysplasia, excessive drooling, a shorter lifespan, and
chronic elbow and knee problems, although it is important to keep in
mind that not all English Mastiffs suffer from these ailments.
(Historically, the overwhelming majority of English Mastiffs were
located in England, particularly prior to World War II. During the Great
War, the breed almost vanished entirely from England; with resources
scarce, it was difficult to feed and house a large breed dog that
consumed almost as much daily as an active soldier. After the war, the
English Mastiff breed rebounded in the United States, but with its
bloodlines extremely narrowed. Many experts believe that the narrowing
of the English Mastiff's bloodlines resulted in its negative health
characteristics -- hip dysplasia, excessive drooling, a shorter
lifespan, and chronic elbow and knee problems -- being compunded.)
Hoping to correct these faults, Flying W Farms crossed the English
Mastiff with an Anatolian Shepherd, a dog that is a guarding breed known
for its intelligence, lengthy lifespan for a large breed, and being
protective of his family, stock and territory. Flying W engaged in
aggressive medical screening of its sires and dams, and the result if
the American Mastiff, which are 7/8 English Mastiff and 1/8 Anatolian
Shepherd.
The new breed looks exactly like a English Mastiff, but without the
excessive drooling that is common in the English Mastiff. This American
Mastiff loves children and are devoted to their families. These are
loyal and calm dogs. They are generally non-aggressive except when their
family is threatened. In those instances they become fierce and
courageous guard dogs. American Mastiffs generally weigh between 150 and
250 pounds
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