Bullmastiffs with very foreshortened muzzles, such as this puppy, are not in keeping with the standard.
In the face of bans against breeding snub-nosed dogs, Helene Nietsch reminds that the Bullmastiff is not a brachycephalic breed.
A Tosa Inu afficionado goes in search of a new puppy.
Dogo breeder and hunter Kassi McLaughlin describes the ideal — and often misunderstood — Dogo Argentino temperament
Enrico Drudi of Tisama Tosa Ken kennel in San Marino shares three decades of experience with the Tosa Inu, Japan's answer to the mastiff.
Cartoon from Punch magazine in 1846 depicting Bill George's famous Canine Castle dog dealership.
London dog dealer Bill George was famous for his canny ability to find a good dog no matter who bred it, which helped produce one of the most famous Mastiffs to first grace the show ring.
Did Sherlock Holmes hunt a Molosser instead of a Hound? Elementary, my dear Watson.
Sumerian dog from 2100 B.C.E., courtesy of the Brooklyn Museum. Can dog breeders -- better yet, should dog breeders -- try to replicate this ancient Molosser?
The creator of the American Molossus seeks to re-create the ancient guard dog of Mesopotamia. The effort has garnered a lot of media headlines -- and not a little controversy.
Working Dogo Argentinos often wear the physical badges of their boar-hunting excursions.
AKC-registered Boerboel must have pedigrees that pass a litmus test.
Can you get your South African-bred Boerboel registered with the American Kennel Club? It depends on what's in that pedigree.
Among all the Molossers, the Boerboel arguably has the most unfixed type. One way to think of the breed is the middle ground between the Bullmastiff and Dogue de Bordeaux.