The words Dog Breed Info with the letter D inside of a black paw print

Ambullneo Mastiff

Information and Pictures

Front view of a large, muscular, wide-chested chocolate brown, brindle dog with a white patch on her chest, a big head, small cropped ears and light brown eyes standing outside in grass looking to the left

Ambullneo Mastiff, Bella a daughter of Anastasia

  • Am-Bullneo Mastiff
Other Names



The head is large with a broad skull, a short muzzle and a tenacious set of jaws. The forehead is slightly arched and the stop is moderate. The nose is wide and has large nostrils. The teeth meet in a level or undershot bite. The ears are usually cropped medium length, lobe and bell; if un-cropped a natural drop ear is allowed. The neck is thick and the shoulders are wide. The chest is deep, broad and heavily muscled. The top line is straight and the tail is wide at the base tapering down and ending at the hocks. The Ambullneo's lateral movement is unsurpassed by dogs of this size. The Ambullneo's thick bone and rippling muscles give the appearance of great strength.


The Ambullneo Mastiff is a natural guardian companion to his pack (family). This highly intelligent K9 loves to please his master at any number of tasks. These dogs are very sensitive to the tone of your voice and need someone to speak with assertiveness, but not harshly. It is not a difficult dog but does require a handler who can assert his authority. The Ambullneo would give his life for his family. Early socialization is a must. They should be obedience trained at an early age. It is important to establish pack leadership and be able to read your dog’s actions and body language. This robust K9 loves to learn new things and is forever searching for approval to strengthen the bond with his master.

Height, Weight

Height: Males 24 - 29 inches (61 - 73 cm) Females 21 - 25 inches (53 - 63 cm)

Weight: Males 130 - 150 pounds (59 - 68 kg) Females 110 - 130 pounds (50 - 69 kg)

Health Problems

As with all Mastiff breeds, hip dysplasia may occur, so until the dog is mature over-strenuous activity should be discouraged.

Living Conditions

Ambullneos do well in the snow as long as there is a warm dog house. They do well in 90 degree temperatures as long as there is plenty of shade, a dog house and plenty of fresh water. They are happiest with lots of yard to patrol and enjoy. No less than a 5-foot fence should surround the property. Ambullneo Mastiffs do not do well in an apartment.


This breed needs a good deal of exercise and plenty of fresh water and shade. They should be taken on daily regular walks to help release their mental and physical energy. It's in a dog’s nature to walk. While out on the walk the dog must be made to heel beside or behind the person holding the lead, as in a dog's mind the leader leads the way, and that leader needs to be the human.

Life Expectancy

About 10 to 12 years.

Litter Size

About 6-8 puppies


The short-haired, slightly rough coat is easy to groom. Comb and brush with a firm bristle brush, and shampoo only when necessary. There is little shedding with this breed. Check the feet regularly because they carry a lot of weight. Also trim the nails when needed. The short, dense coat is easy to groom with a good brushing once a week.


A relatively new breed, the Ambullneo Mastiff made its debut in the early 1980s in Southern California. Mark Reasinger, Ph.D. began this 57.5%, 42.5% Mastiff Bulldog breeding program and another decade passed before the F1 progeny was ready to be stored in the cryogenics bank. After testing for intelligence, hips, elbows and other physical abnormalities only the finest puppies and dogs were used. The breed is now in its 16th generation.


Mastiff, working

  • NKC = National Kennel Club
  • DRA = Dog Registry of America, Inc.
A litter of four puppies, two black brindle and two brown in front of their bowls of kibble standing and sitting in hay

Litter of Ambullneo Mastiff puppies

Two large, thick bodied mastiff type dogs with very large heads and small cropped ears outside in front of a stone wall

Ambullneo Mastiffs, Rocco as an adult standing in front of Monga

A little, thick bodied black puppy walking in front of her littermates with a chainlink cage behind her

Rocco the Ambullneo Mastiff as a puppy

A large breed, black, brown brindle mastiff dog with her head leaning over top of her litter of puppies

Rocco the Ambullneo Mastiff as a puppy with his mother GeeGee and littermates

See more examples of the Ambullneo Mastiff