The Bullmastiff is mistakenly thought of as one of Britain's oldest dog breeds. However, it is actually the Mastiff that is the oldest breed. The Bullmastiff, on the other hand, is a fairly new dog breed that has recently developed. History does show a few crosses between these two dogs as early as the 1790s, but there is no direct evidence that suggests these two strains were used to breed on. read more >