American Mastiff.jpg
Breed Group Group 3: Molossoids and Mastiffs Breeds
Sub-group :
Origin Country United States
Weight Males: 160-200 pounds. Females: 140-180 pounds.
Height Males: 32-36 inches. Females: 28-34 inches.
Other Name(s) AmMas
Breed Type Pure
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American Mastiff

Breed Group Group 3: Molossoids and Mastiffs Breeds
Sub-group :
Origin Country United States
Weight Males: 160-200 pounds. Females: 140-180 pounds.
Height Males: 32-36 inches. Females: 28-34 inches.
Other Name(s) AmMas
Breed Type Pure
click here for FULL BREED STANDARD

Origins

The Flying W Farms American Mastiff™ was developed over many years of selective breeding by Fredericka Wagner of Flying W Farms in Piketon, Ohio. The goal was to develop a dog that had the size, temperament, disposition, and appearance of a Mastiff, but with fewer health problems and a much dryer mouth than other mastiff breeds. This was accomplished by crossing the English Mastiff with the Anatolian Mastiff during the early development of the breed.

CKC recognized the American Mastiff breed as purebreds in January of 2000. Thereafter only offspring of purebred-registered American Mastiffs having CKC AR numbers will be accepted for registration as Purebred American Mastiffs.

Please note: The American Mastiff breed is not eligible for CKC's Picture and Witness (PAW) Program.

Breed Characteristics

Head: Somewhat brachycephalic skull-type that is broad, deep, full, of moderate size, and in proportion to the rest of the body. Overall, the head is rectangular in shape and somewhat clean cut, without excess pendulous skin. The topskull is broad, being as broad as it is long (from stop to occiput). From the front, the skull appears flat between the ears. In profile, the forehead may appear slightly arched. A median furrow that begins at the stop and runs upward toward the occiput may be visible in mature dogs. This furrow is enhanced by strongly developed temporal muscles. The brows are slightly prominent. The head should never appear elongated, narrow, snipy, or resembling in any way that of a Great Dane, nor should it be coarse like that of a Bullmastiff. The head is relatively clean cut without excess skin or wrinkle.

Eyes: Moderate in size, set well apart, and open-almond to oval in shape. The eyes are set well under the brows. The eye rims are well-fitted and darkly pigmented, without any looseness, excess skin, or visible whites or haw. Absolutely no sign of entropian or ectropian. Eye color may range from hazel-brown, amber to dark brown, the darker the better. There should be sufficient bone in the surrounding orbital sockets to protect the eyes.
Ears: Somewhat small to medium in size, set high on the skull and well apart, at the highest and widest corners of the skull. The ears are dropped and v-shaped, with rounded tips. The ears are never long, overly large, or broken. The inner edge of the ears should lie close to the head when alert.
Muzzle: Of moderate length and size, well-developed, broad, deep, and full, always in proportion to the head. Upper and lower jaws have good bone substance, are strong, well-developed, and never appear snipey or weak. The muzzle never tapers, but instead ends rather bluntly, forming a right angle, as opposed to appearing rounded.

Nose: The nose is well-pigmented and black. The nostrils are well-opened.
Neck: Moderate length, powerfully-muscled with a slight arch. The neck tapers smoothly from the deeper and broader body toward the head. The neck should be dry for the most part, without excess skin or pendulous dewlap; however, skin may be just slightly looser on the throat and neck area.
Chest: Deep, broad, but never wider than deep. The brisket extends to the point of the elbows.
Body: Powerful, deep, substantial, and solid at maturity. The body should never appear racy or refined. Width at forequarters is approximately equal to the width at the hindquarters
Feet: Oval to round, compact, with well arched toes, and tough pads.
Tail: Set high on the croup, thick at the base and tapering toward the tip. Carried in accordance to the dog’s mood and energy level, but never tucked or carried up over the back. Tails are medium in length, with the tip of the last vertebrae extending to the hock joints when held down. The tail may be straight or gently curved.
Movement: In movement, the gait denotes power and strength; rear legs drive while forelegs track smoothly with good reach. The American Mastiff should move effortlessly, efficiently, and without any sign of encumbrance. The characteristics of healthy structure are evident: when moving away, the forelegs and rear pasterns should remain parallel to one another. When viewing movement from the front, the forelegs should remain parallel, with elbows and paws moving neither moving in nor out. From the rear, the back pads should be visible when the rear legs are extended. As speed increases, the forelimbs and hindlimbs will converge to the center line of gravity. From the side, the topline should remain firm and level. Good reach of movement in the front allows the forepaw to extend out in a line with the nose. The width between the forefeet when extended should be approximately equal to the width between the hindfeet when extended, indicating balance, good reach, and good drive. Dogs that exhibit any sign of breathing or locomotive difficulty shall be disqualified from the show ring.
Temperament: The American mastiff is a combination of grandeur, good nature, and gentleness. Dignity rather than gaiety. They are neither shy nor vicious. The well-trained American Mastiff is calm, controlled, and confident. Understanding, patient, and loving with their family, especially children. They are generally aloof towards strangers. A well-socialized American Mastiff is friendly yet sensitive and alert to changing situations. They are not aggressive by nature but will defend their family if necessary. They respond to threats with judicious warnings and courageous action if needed. Any unprovoked aggressive or fearful behavior toward people is incorrect for this breed. Any unprovoked aggressive or fearful behavior toward people is incorrect for this breed.
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Breed Standard

BREED GROUP 3: Molossoids and Mastiffs Breeds

Proportions: The American Mastiff is a large, well-balanced dog of sound body and mind. The body length (from prosternum to the point of the rump) is slightly greater than the height at the withers. The body substance is sturdy, well-muscled, and heavy boned without appearing cloddy or overly heavy. Males should appear masculine, being more substantial in size and mass, while females should appear more feminine and slightly less substantial. Neither should lack overall type.

Head

General Appearance: Somewhat brachycephalic skull-type that is broad, deep, full, of moderate size, and in proportion to the rest of the body. Overall, the head is rectangular in shape and somewhat clean cut, without excess pendulous skin. The topskull is broad, being as broad as it is long (from stop to occiput). From the front, the skull appears flat between the ears. In profile, the forehead may appear slightly arched. A median furrow that begins at the stop and runs upward toward the occiput may be visible in mature dogs. This furrow is enhanced by strongly developed temporal muscles. The brows are slightly prominent. The head should never appear elongated, narrow, snipy, or resembling in any way that of a Great Dane, nor should it be coarse like that of a Bullmastiff. The head is relatively clean cut without excess skin or wrinkle.

Expression: Kindly, calm, noble, watchful, intelligent, and alert.

Stop: The stop is definite and well-developed
Skull: The ideal muzzle-to-skull ratio is between 2:3 and 1:2, with the topskull slightly longer than the muzzle.
The ideal muzzle-to-skull axis may be either parallel or convergent.
Muzzle: Of moderate length and size, well-developed, broad, deep, and full, always in proportion to the head. Upper and lower jaws have good bone substance, are strong, well-developed, and never appear snipey or weak. The muzzle never tapers, but instead ends rather bluntly, forming a right angle, as opposed to appearing rounded.

Lips or Flews: Thick, well-pigmented, and well-fitted, yet sufficiently loose enough to allow for the muzzle to appear squared in profile. Never excessive or overly pendulous as to extend well beyond the lower jaw and appear like that of a Neapolitan Mastiff.
Nose: The nose is well-pigmented and black. The nostrils are well-opened.
Cheeks: The cheeks are powerfully muscled, without appearing chiseled or coarse.
Dentition and Bite: Forty-two strong, clean, white teeth. Bite may be level, scissor, or reverse-scissor. Contact must be made between the top and bottom incisors. Missing or broken teeth as a result of routine work is not to be penalized. The teeth should never be visible when the mouth is closed.
Eyes: Moderate in size, set well apart, and open-almond to oval in shape. The eyes are set well under the brows. The eye rims are well-fitted and darkly pigmented, without any looseness, excess skin, or visible whites or haw. Absolutely no sign of entropian or ectropian. Eye color may range from hazel-brown, amber to dark brown, the darker the better. There should be sufficient bone in the surrounding orbital sockets to protect the eyes.
Ears: Somewhat small to medium in size, set high on the skull and well apart, at the highest and widest corners of the skull. The ears are dropped and v-shaped, with rounded tips. The ears are never long, overly large, or broken. The inner edge of the ears should lie close to the head when alert.

Body and Tail

General Description: Powerful, deep, substantial, and solid at maturity. The body should never appear racy or refined. Width at forequarters is approximately equal to the width at the hindquarters
Neck: Moderate length, powerfully-muscled with a slight arch. The neck tapers smoothly from the deeper and broader body toward the head. The neck should be dry for the most part, without excess skin or pendulous dewlap; however, skin may be just slightly looser on the throat and neck area.
Chest: Deep, broad, but never wider than deep. The brisket extends to the point of the elbows.
Topline: Level from somewhat prominent withers to croup. The back is broad, straight, firm, strongly muscled, yet supple. Loins are strong and broad and may be straight and level with the back or slightly arched. The topline is never overly long, swayed, roached, or sloped in either direction
Croup: Just slightly sloped.
Underline: A slight tuck up may be present, or the underline may run parallel to the topline. The underline is taut and firm, without any indication of sagging or excess weight.
Ribs: Long, well-sprung, well-laid back, oval-shaped, never barrel-chested or slab-sided.
Tail: Set high on the croup, thick at the base and tapering toward the tip. Carried in accordance to the dog’s mood and energy level, but never tucked or carried up over the back. Tails are medium in length, with the tip of the last vertebrae extending to the hock joints when held down. The tail may be straight or gently curved.

Forequarters and Hindquarters

Forequarters: Forequarters are always in balance with the hindquarters. Forequarters are well-angulated with well-laid-back shoulder blades. Shoulder blades are approximately equal in length to the upper arm and forearm.
Elbows: Elbows are close to the body. The point of the elbows is approximately half the dog’s height at the withers.
Forelegs: Frontal View: Straight, of good muscle and moderately strong bone, and parallel to one another.
Side View: The forelimbs appear straight with strong pasterns.
Pasterns: Never weak or broken.
Hindquarters: Upper thigh and lower thigh are equal in length, strong, sturdy, of good muscle and moderately strong bone.
Rear View: When viewed from the rear, the rear pasterns are parallel to one another.
Side View: Good angulation will allow the rear toes to align with the point of the rump, or within one to two paw-lengths behind the point of the rump, with the rear pasterns remaining perpendicular to the ground and parallel to one another.
Stifle Joint: Well-angulated with a good bend to well-let-down rear pasterns.
Angulations: Angulation of hindquarters is always in balance with angulation of forequarters.
Feet: Oval to round, compact, with well arched toes, and tough pads.

Coat

Skin: Rather well-fitted, yet pliant and supple. The skin should never obstruct the outline of the dog.
Coat Type: The American Mastiff comes in two coat varieties; the standard smooth-coat and the fluffier long-coat.
Smooth coat variety: The coat is short, smooth, dense, close to the body throughout. The texture is soft and glossy. Coat may have a very slight ruff on neck, and slightly longer hair on the tail. No fringe or feather permissible.
Long-coat variety: The coat is short on the face, forehead, and front of the forelimbs and hindlimbs. The coat is longer on the neck, ears, rear of the front and hindlimbs, feet, and tail, forming well developed fringe and furnishings.
Coat Color or Pattern: All shades of fawn, including very light to apricot (ranging from light tan to dark reddish tan) or brindle; always with a melanistic mask that extends up the entire muzzle, and around the eyes, sometimes beyond.

Movement

In movement, the gait denotes power and strength; rear legs drive while forelegs track smoothly with good reach. The American Mastiff should move effortlessly, efficiently, and without any sign of encumbrance. The characteristics of healthy structure are evident: when moving away, the forelegs and rear pasterns should remain parallel to one another. When viewing movement from the front, the forelegs should remain parallel, with elbows and paws moving neither moving in nor out. From the rear, the back pads should be visible when the rear legs are extended. As speed increases, the forelimbs and hindlimbs will converge to the center line of gravity. From the side, the topline should remain firm and level. Good reach of movement in the front allows the forepaw to extend out in a line with the nose. The width between the forefeet when extended should be approximately equal to the width between the hindfeet when extended, indicating balance, good reach, and good drive. Dogs that exhibit any sign of breathing or locomotive difficulty shall be disqualified from the show ring.

Temperament

The American mastiff is a combination of grandeur, good nature, and gentleness. Dignity rather than gaiety. They are neither shy nor vicious. The well-trained American Mastiff is calm, controlled, and confident. Understanding, patient, and loving with their family, especially children. They are generally aloof towards strangers. A well-socialized American Mastiff is friendly yet sensitive and alert to changing situations. They are not aggressive by nature but will defend their family if necessary. They respond to threats with judicious warnings and courageous action if needed. Any unprovoked aggressive or fearful behavior toward people is incorrect for this breed. Any unprovoked aggressive or fearful behavior toward people is incorrect for this breed.

Faults

All dogs should be in proper healthy condition, free from disease or defect. Any departure from this description is considered a fault. Unless altered, all male dogs should have two fully descended testicles.