According to the Black Russian Terrier Club of America, Inc., a well-bred and socialized Black Russian Terrier is loving toward his family yet reserved around strangers. Just as their Soviet owners had envisioned them to be years ago, today's Black Russian Terrier has the instinct to guard and protect. Highly intelligent, he learns easily and remembers information (good or bad) for a long time. They require regular brushing and daily exercise.
The bullmastiff is fearless and confident yet remains docile and sweet-natured with his family. They are natural guardians of the home but do not bark much, as silence was a virtue when guarding estates. Bullmastiffs are independent thinkers and may not respond to traditional obedience training. The breed does not require much exercise or grooming, and can live happily in a house or apartment.
The Cane Corso is intelligent and easily trained. As a large and athletic breed, they need a lot of exercise. They are affectionate to their owner and bond closely with children and family. Cane Corsos are light shedders, which make grooming simple – all they need is an occasional brushing.
The Dogue de Bordeaux possesses an instinct for guarding, which he does with vigilance and courage, but without aggressiveness. He is an excellent companion - affectionate and attached to his family -- with a patient, calm temperament. Their short coat is easy to care for and they require moderate daily exercise. New owners should be prepared to deal with drool!
While affectionate with his family and quiet and tolerant in general, if there is something to guard or protect, great Pyrenees can become quite territorial. Because they were bred to work independently and make decisions on their own, Pyrs may not be the star of the local obedience class.
The Newfoundland's sweet disposition makes him a good fit for families. Although he appears somewhat docile, he is an active dog and will need daily exercise. Regular brushing is important to maintain his plush coat. Newfs are also an intelligent breed and are readily trained.